Spirituality is often hard to evaluate.....
MY own personal view is that IF a practice serves to help one feel closer to God, closer to the Gospel - I tend to be pretty accepting (even if it's something I would not do). But if the custom is some self-righteous thing ("I'm better than you because.... God smiles on ME because I do....") then it's actually drawing people away from God and the Gospel.
I guess because of my Catholic roots, I do the Sign of the Cross in my prayer life and in worship.... it's just "choreography" (as my formally Reformed wife calls it, lol) but it helps me focus and helps me think of the Cross and my Baptism. She doesn't ever do it because she finds it distracting. She fully affirms MY doing it.... I fully affirm she doesn't. What floats your boat, lol. I like to kneel when I pray, she doesn't.... whatever. We BOTH tend to fold our hands when we pray..... Choreography.... okay if it helps, not if it doesn't. One of the things I love about Lutheranism is our stress that HOW we worship is not mandated.
- Josiah