I'm one of those tune down and goers.
1985 Epiphone P bass, D'Addario Chromes, 50 - 105, 1/2 step down, not a problem.
Haven't gone down to C on this one yet. Probably won't, action is already super low.
2012 Ibanez SRX2EX2, D'Addario Chromes, 50 - 105, 1/2 step down, not a problem.
Same bass dropped to C, still sounds good but my playing style and lower action dictates higher action or I'm digging into unwanted fret buzz from the lower tension if I'm not mindful of my playing and ease up with the fingers. Intonation probably needs to be adjusted as well
2018 Ibanez SR400EQM, D'Addario Nickels, 45 - 105, half step down all the way to drop C, not a problem for any of it. But I also keep the action a little higher on this one. And the intonation doesn't seem to be a problem dropped down. This goes along with the dedicated setup train of thought. If you're going to do anything lower than half step, have your bass set up for it.
IME, even a half step more often than not calls for a complete setup and more importantly, a commitment on the part of the guitarists to do the same. It’s much easier to simply down tune on a bass (disregarding intonation) than it is for guitar.
Unfortunately, many guitarists think that learning the song at standard pitch and simply tuning down for the performance is all there is to it, and it’s often readily obvious because of the flabby sonic mess that comes as a result to that approach. The amplified frequency points all need to be considered as the guitars encroach even further into the range of the bass. Unless everyone is on the same page, it can get messy.
