this can't really be said about the brand I had to deal with, it is one of the common big names at least here in the old world, they had a medium sized model where electronics (VFD for the motor I mentioned earlier) would last about the period of warranty, and then they would fail, and when you call them for the repair, they'll give you the standard line - oh, that was the old model control, we don't support that one any more, you need to replace the whole control with the new model, and for that 2 storey model in particular, it was around 15k EUR
and this was a very common problem with that particular control, solved it for one of the elevators (IGBT and some supporting electronics were shot), the other one - same exact issue, blown IGBT, fixed once, worked fine for couple weeks, then blew up again, and the elevator company tech came down to check if everything was fine after the first repair, and there were zero issues as far as I could tell, but then I gave up on the whole thing, if I can't guarantee the validity of repair, I'm not going to take the job, I guess I got lucky with the first one that didn't blow up (as far as I know)
there are however quite a few parameters to tweak with those VFDs, but it is done all via their proprietary control, and probably those service techs installing them are using some "default" values and not really diagnosing the problem to find the issue, they just suggest to replace the whole thing, afair that there was like 30% failure rate in under 3 years of service for that particular model of the control