I think it would be really useful if I could sort collections (alphabetical, chronological, price, development status, length, etc.) It would also help if I could search inside collections and filter for certain tags.

It might not be excactly the same thing, but kind of related; to be able to browse or search for collections from the main page.

It would make curated recommendations or thematic collections etc more easily accessible, and make discovering new games both easier and more fun.