Then being involved in the Pentecostal church, I know how to do free worship and I even led it. Free worship people also have a liturgy, make no mistake about it. They do not conform to a formal liturgy but they have a liturgy nevertheless. First there is a singing of 4 fast joyful songs, and then followed by 4 soft solemn songs - and you do this for 40 minutes. I can predict what happens in the service.
In both cases, in the formal RC and informal Pentecostal - I can predict what is about to happen and when. They can both leave you dry and what Jesus says when you are comfortable and proud that you are "doing it" Jesus says Mk 7:6. I do believe Jesus is interested in my heart, he is, precisely because it is filled with deceit and wickedness and he wants to cleanse it - cover it with his forgiveness, so I am convinced Jesus is interested in my heart and I agree with my Judge quickly that my heart as not clean.
I can understand the fascination with ritual and formality and the drag of being "high" church. My theory is that pop society and pop culture has been starved of any tradition - even social tradition. Today young people are embarrassed in having any program in their party celebrations such as having a toasts, giving speeches, any social ritual is rejected. Hence, the hunger is explainable. Every ancient culture has some tradition, it is what identifies them and for a people not to have one, not to have a decorum, is to have no identity. So the hunger is understandable, and the liturgy can be used for it. But there is a catch, when it becomes a canon, a Law, then we are back again to works. The liturgy which is designed to uphold the Gospel becomes its robber.
I need not say anything more but commend- Past Elder's - New Wine, Old Wine Skins
The point being, fidelity to the historical liturgy of the church guarantees nothing in itself, and it is possible to use the historic liturgy in a thoroughly heterodox effort. Therefore, the real enemy, if that is the best word, is not non-liturgical services or non-traditional church music, it is doctrine. Teaching.Here is also my observation, you can rally for the historic or elaborate liturgy and rally for your synod officers to be impeached, you can even be embroiled in your synod politics, criticize colleagues for adopting heterodox methods etc etc, but if you as a pastor aren't giving your people the Law that shows their sin and the Gospel that heals and comforts them in your worship service, all that rallying for liturgy and thumping etc. is just smokescreen. IMHO.