A party/cover band I was in built on 80% personal relations and 20% musicality and capability. Drummer with no sense of time, a bass player who followed the singer instead of the drummer a keyboard player who used much prescence nagging about the unsteady beat and time feel, unstable singers. One band member did printed arrangements of all songs to everyone to make sure we were all "on the same page". There seemed to be a rule that every song should have at least one guitar solo and most songs were transposed constantly to accommodate the tonal range of the singers. Still, after 30+ years, the bass player claims being unable to hear the bassline of the original track. Despite the written arrangements the songs were always sounded different from time to time. On stage most had a sturdy black note stand with the printed arrangement in front of them, which - together with stage monitors, light stands and front speaker stands - sort of made a black wall between us and the audience. Supported a bit by the access to printed arrangements nobody cared to memorise the songs, meaning that most of us were staring at the printed arrangement meaning a loss of contact to the audience.
Despite that we did get 2-4 quite successful gigs in the best years.
We did change many of the songs by simplifying parts that we could not play.