I can relate to this. I dont really care about replacing some older models with newer sculpts, but i dont like them invalidating older model by not updating their rules. I dont like powercreep. Imo people will always buy new sculpts because people like new shiny things. No need to remove old models from battletomes or dont update their rules to a new standard to keep older models relevant.
(Still got Isle of blood Skaven to build)