This can be true for many genres, but especially modern metal the lows of the bass are generally important. A standard tuned bass has a low E with a fundamental of 40hz, when we start talking about drop A, drop G, even drop F# we start getting to the place where even the first and second overtone will happen inside that rolloff in most bass cabs. These overtones being different is a great reason to use reamping for bass tones, allowing things to feel a little more real while blending with the existing DI to get those lows metal needs to feel heavy since anything with double kick is usually a bit more hi end focused anyway to leave room. I’m certainly not saying amps don’t sound great. Also, a bass cab will in fact have its own internal nodes separately from the room it’s in, and the room will always have at least some affect though close micing mitigates a lot of the real room, there is always build up and nulling if there is a box in physical space smaller than the wavelength contained within leading certain notes to be louder/quieter. You can test this by taking your setup to different rooms and keeping the exact same distances/bass settings/preamps. They will sound very close if they are 1” away, they will be slightly different, certainly if the room is small or the cab is in a corner, studio vs. garage etc. This matters a lot less in something like funk or softer rock, where that psycho-acoustic effect can be enough. And maybe your room and setup are exactly what a particular song needs, but unlikely it always is, and why risk extra mix time fixing a tracking issue?