I've gone through this with my previous band.
We wrote a song (the only one that really ever took off - small scale) in 7/8. The song had a breakdown where the song dropped dynamically to very soft, guitar-led quiet part into a build-up towards last chorus (a very original idea I guess you have never heard of...).
On the recorded version, this section of the song had the drummer lightly tapping on the ride, riding the cymbal dynamically with the chord-changes and lyrics. It sounded pretty good to me. Come mix-time, by BL's sole decision, the drummers contribution on this part was muted leaving the guitar totally alone. Also, my bassline - leading into a build-up, was cut off.
Guitarist had serious problems keeping the time, not only messing up timing but also time signature.
So, for a couple of months we played the song live, and drummer would tap on the hihat extremely lightly, almost more a visual cue than anything else, to help keep time in this quiet part of the song.
Later our BL, who wanted the live version to match recorded version more, wouldn't allow any help from the drummer, thus turning the part into an embarrassing train-wreck. So, after many tries to ease the situation for the guitar player (BL categorically rejected every suggestion) they decided (I was strongly against) to change the time signature of that part into 4/4, noting that nobody would pretty much notice (remember, the recording had some airplay at that moment, and this was pretty much our only "hit" and last song of the set).
Of course people noticed, and many fellow musicians commented on the change, citing that they liked the part better when it was 7/8. Also, they felt that changing the part dumbed down the build-up, and changed the tension that the part previously had. I agreed, and still do.
The funny part is, the BL also insested that changing minute details on (other) songs would totally destroy them, and they had to be learned almost note-to-note.