I do like the idea of keeping a bass simple. You can buy a preamp pedal and use it on all your basses. Technology changes and maybe what was state of the art 10 years ago is outdated, noisy etc.
But in the end, I like to have control on my bass. I travel a lot and have to play on different bass rigs. I don’t want to experiment on a new amp on the fly.
I try to set up an amp as flat as possible and use my onboard pre to get it in the ballpark. I bring my own DI (RNDI) and it’s simple! No checked luggage!
I’ll walk over to the drummer’s wedge and see what my bass sounds like. It’s a fairly good representation of what it sounds like at FOH. I usually don’t use a lot of eq anyway but some rooms may call for it.
I adjust my hand position to fit in the mix more too. Too boomy, I play closer to bridge. Too thin, then closer to neck.
I don’t want to run over to amp and tweak in the middle of a song. Having an onboard pre is quicker but I don’t want the bottom to drop out for even a second! The audience may not know what the bass player is doing but they know when you stop!