Why would a company downgrade their hero product?

Why would this brand change a well- loved formula into one that is inferior and causes skin issues, per the many negative reviews? This WAS my favorite skin care product, but now the search is on for something else.

Originally posted on sephora.com

Acne prone, dry/combo

This product glides on so nicely, it looks like it may dry matte, but the way it soothes my skin immediately is amazing. Doesn’t leave my skin greasy or looking oily at the end of the day

Originally posted on sephora.com