People who use resin printers usually go for the high detail instead of engineering properties - main users tend to be either cosplayers or mini modelers.
Engineering prints are certainly possible I think, but you'd need some specialist resins.
Personally I'd stick with FDM for making functional prints.
Thanks for sharing your experience.
Did you try engineering resins, like Siraya Tech's "Build", "Sculpt", etc.?
I make some small parts that I FDM print, then CNC mill for accuracy. Was hoping to switch to resin printing, instead.
I experienced every issue I mentioned first-hand, in practice.
I suppose it's possible I was uniquely naive in attempting to get engineering quality prints out of a consumer resin printer? It seems there's a good reason every resin 3D printer promotes itself with pictures of figurines rather than anything more demanding.
My experience was that getting good results when printing something like a plastic bottle cap wasn't just a matter of dialing in the exposure - I had to dial in the exposure, the room temperature, the conditioning of the resin, the support placement, the orientation, and design the item geometry with printing in mind. Even then the results were adequate rather than impressive.