Interesting OP. I had to read all the subsequent posts before I understood the OP’s frame of reference. They play behind a glass wall, apparently, at concerts - enormously loud guitar and electric bass band concerts. Back in the day, my own frame of reference, players attended to a musical concept known as “balance.” It meant that all players needed to listen to each other and to blend together in such a way so as to make each part a significant aspect of the whole. This meant sometimes playing what we used to call “quieter.” Even when playing on a stage or in a larger hall, the individual musicianship of the players was central to the way the work sounded, including the way one modified one’s dynamics. (Dynamics is a term that refers to the relative loudness and forcefullness of the music.) Top-notch ensemble playing, particularly in improvisational forms such as jazz, required players with great ears, to listen to one another and to adjust accordingly. Apparently, today’s music, particularly concert form, does not require some of the same features as it once did. Incidentally, the Chicago Symphony Orchestra, as well as several others I’d imagine, has experimented with plexiglass barriers between the percussion section and the rest of the band, meaning that, despite the sarcastic tone of my response, certain composers wrote in such a way that meant even the finest of musicians could not avoid overpowering other players, thus necessitating such measures.