External orders should be chosen carefully

For even though from the viewpoint of faith, the external orders are free and can without scruples be changed by anyone at any time, yet from the viewpoint of love, you are not free to use this liberty, but bound to consider the edification of the common people, as St. Paul says, I Corinthians 14:40, ‘All things should be done to edify,’ and I Corinthians 6:12, ‘All things are lawful for me, but not all things are helpful,’ and I Corinthians 8:1, ‘Knowledge puffs up, but love builds up.

…You cannot plead, ‘Externals are free. Here in my own place I am going to do as I please.’ But you are bound to consider the effect of your attitude on others. By faith be free in your conscience toward God, but by love be bound to serve your neighbor’s edification

Martin Luther
The Freedom of a Christian

For Luther, worship style is a balance

Those who devise and ordain universal customs and orders get so wrapped up in them that they make them into dictatorial laws opposed to the freedom of faith. But those who ordain and establish nothing succeed only in creating as many factions as there are heads, to the detriment of that Christian harmony and unity of which St. Paul and St. Peter so frequently write.

Martin Luther
A Christian Exhortation to the Livonians Concerning Public Worship and Concord

All that matters to Luther for the Mass was the Words of Institution and faith

But in all these matters we will want to beware lest we make binding what should be free, or make sinners of those who may do some things differently or omit others. All that matters is that the Words of Institution should be kept intact and that everything should be done by faith. For these rites are supposed to be for Christians…who observe them voluntarily and from the heart, but are free to change them how and when ever they may wish. Therefore, it is not in these matters that anyone should either seek or establish as law some indispensable form by which he might ensnare or harass consciences. Nor do we find any evidence for such an established rite, either in the early fathers or in the primitive church, but only in the Roman church. But even if they had decreed anything in this matter as a law, we would not have to observe it, because these things neither can nor should be bound by laws.

Martin Luther
An Order of Mass and Communion for the Church at Wittenberg

Luther states that Christ does not really care about worship style

I have no intention of cramping anyone’s freedom or of introducing a law that might again lead to superstition. Christ will not care very much about these matters, nor are they worth arguing about.

Martin Luther
An Order of Mass and Communion for the Church at Wittenberg

Luther didn’t change worship style more only because the people couldn’t handle it

Until now I have only used books and sermons to wean the hearts of people from their godless regard for ceremonial… For I have been hesitant and fearful, partly because of the weak in faith, who cannot suddenly exchange an old and accustomed order of worship for a new and unusual one, and more so because of the fickle and fastidious spirits who rush in like unclean swine without faith or reason, and who delight only in novelty and tire of it as quickly, when it has worn off. Such people are a nuisance even in other affairs, but in spiritual matters, they are absolutely unbearable. Nonetheless, at the risk of bursting with anger, I must bear with them, unless I want to let the gospel itself be denied to the people.

Martin Luther
An Order of Mass and Communion for the Church at Wittenberg

Luther advises worship styles and traditions as mutable and optional

This is my advice: If your lord, the margrave and elector, etc., permits the gospel of Jesus Christ to be preached with purity and power and without human additions and the two sacraments of Baptism and the Body and Blood of Jesus Christ to be administered and offered according to their institution…go along in God’s name and carry a silver or gold cross and wear a cope or alb of velvet, silk, or linen. And if one cope or alb is not enough for your lord, the elector, wear three of them…Moreover, if His Grace is not satisfied that you go about singing and ringing bells in procession only once, go about seven times…If your lord, the margrave, desires it, let His Grace leap and dance at the head of the procession with harps, drums, cymbals, and bells…I am fully satisfied, for none of these things (as long as no abuse is connected with them) adds anything to the gospel or detracts from it. Only do not let such things be regarded as necessary for salvation and thus bind the consciences of men…Only what God commands is necessary; the rest is free.

Martin Luther
Letters of Spiritual Counsel

Luther on stripping ceremonials from the Mass

In the first place, in order that we might safely and happily attain to a true and free knowledge of this sacrament, we must be particularly careful to put aside whatever has been added to its original simple institution by the zeal and devotion of men: such as vestments, ornaments, chants, prayers, organs, candles, and the whole pageantry of outward things… All the rest is the work of man, added to the word of Christ and the mass can be held and remain a mass just as well without them.

Martin Luther
The Babylonian Captivity of the Church