Just for gaming purposes, having a unified front end that:
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lets you start an application with the arguments it needs, whether to use a specific Wine folder, or start an emulator with the right arguments
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lets you tag up each application with some custom arguments - genre, date, and so on - and lets you filter and sort by them
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lets you configure each app with their own box art or whatever as an icon
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keeps some gaming-related metadata; hours played, whether you’ve finished it, …
Essentially, Windows 3.1 Program Manager for the 21st century. Lutris did that quite well. Heroic doesn’t let you add custom stuff, it just integrates with store fronts. RetroArch has the old-school Linux problem of “all the functionality you need, plus all the functionality anyone might ever need, plus all the functionality that no-one needs, all arranged seemingly at random in dozens of menus”.
Lutris scripts were great - just having the required winetricks commands to get something obscure working was awesome, but packaged up in a useful way along with art and metadata was handy. The front-end being “only what you need” was good as well. Shame it’s gone off the rails a bit…
It lets you “add game”, but then gives you the choice of Linux / Windows with a Wine version / browser, and you have to put in the path.
So for example, in Lutris I could have “every Zelda game” or “every Castlevania game” as a filter. Castlevania needs MSX, NES, Gameboy, SNES, N64, DS, PSX, PS2, and Wii emulation; and one of (Steam, or PS3 or X360 emulation) to be reasonably complete.
I suppose I could create a Linux shell script that daisy-chains into the correct emulator, but that would be quite clunky compared to Lutris, which is still pretty clunky. And I wouldn’t be able to filter to that, nor sort them by release date.