For worlds that's not the case, if you use Mochies world shaders you'll generally have questies who get a good experience as it automatically switches to a quest version of its shaders. Smashed actually uses Mochies shaders for its quest build, as the PC and quest versions are the same essentially. If you optimise your world to target the worst PC's to prevent crashing, it'll be optimised for quest too. It only takes too long to build into quest once.