I play on two monitors and often have screenshots open on a second for puzzle games or metroidvanias.
I prefer to use XnView for that because of convenient zoom and mouse-over scrolling.
On current steam it takes about 5 clicks to open a game's screenshot folder. On Beta that function is gone entirely - all I need is either an option to open with system's default app in right-click-dropdown or the same toggle in options.

I do not want to abandon Steam-sreenshot's entirely and switch to ShareX because I also want to keep uploading screenshots on Steam.