I am actually more worried about colour bleed or colour transfer. I rinse my fabrics in hot-as-my-hands-will-stand water. If a fabric bleeds colour, it gets more treatment. BTW that also takes care of shrinkage. Small stuff is laid out to dry or ironed dry. Big stuff is thrown in the dryer.
I think of 'precuts' like 'prefab' meals from the grocery store. Okay but not as good as home made. You bought a shortcut but you did not get the quality of product that you expected.