I agree the UI can be feel a bit spread out (you access the stores at the Stores section, but your games are at the Library), yet I personally couldn’t even come up with a better way for them to do things.

I used to hate non-steam gaming as I could never figure out Lutris, but then I tried Heroic and it was really intuitive for me to the point I now use it more than Steam (I’ve always played non-Steam games often, but I used to add them as to Steam as third-party games and it was always clunky).