I kind of understand where you’re coming from, my back having got significantly worse over the last couple of years all I take to gigs is bass and Behringer BDI21. If there’s an amp there great I’ll use it, if not BDI21 to FOH with a monitor mix, this works fine and the band all seem fine with it too.
As well as the not having to carry the gear about another important aspect for me is not having to set it up/break it down.
I still prefer the sound of an amp behind me - at the same volume as the kit I should add, no louder - but my overall preference is for my back not hurting, hence said Behringer.
I doubt I’ll go IEM due to the bands I’m with being unlikely to, and I think once I stop gigging with these I’ll be stopping gigging completely.
I doubt I’ll ever stop looking at amps/cabs though, I just won’t be buying any anymore.