You are absolutely correct that the conventional bass crowd refuses to use multi-piece rods, but I would argue their bias is based more on perception than reality.
I agree with Tom, but would add there's a bit of reality too. Prior to my fly fishing renaissance, I was an avid bass tournament angler. The standard casting rods back then were 5 1/2 to 6 feet long - unlike fly rods which were mostly 8 to 9 feet long. And even though the casting rods have increased in length somewhat (now mostly 6 1/2 to 7 feet), the differential still exists. Enough that the issue of storage for the bass angler isn't as critical as the fly angler.
If you look at how bass anglers store rods, it's mostly inside their boats (of which bass boats are built for rod storage of 7-8 feet) or inside their SUVs or trucks. Most of the bass club members I fished with never took an airflight to go fishing, ever. On the other hand, most fly anglers are like nomads.
I fish a lot of kayak tournaments these days, mostly inshore and a few bass. Most of the participants use 1 or 2 piece rods, and the rods are stored in ready reach or in DIY tubes or in built-in "rod pods". All of which facilitate a minimum of 2 piece. There's no reason for yakkers to NOT use 4-piece, but again, there's no reason for them to do so. Given no incentive, I doubt there'll be a mass exodus to 4-piece anytime soon by tournament anglers.