Don't know what I would do without the transposer for keyboards, & tuning down my acoustic guitar & having a CAPO handy....
I could care less about the purist opinions'....As long as I can do what I need on stage & the audience loves the music it means nothing to me what others opinions are...
It's all about the end result
Hmmmm, just curious; what did you do 'back in the day' before transpose buttons?
chas