Seems like every week over on GamingOnLinux there’s an announcement of a new launcher.
Personally I only use Steam & Lutris. Lutris for my gog games and BattleNet, Steam for everything else.
I don’t know of a good reason to use Heroic, or any of the other new ones over Lutris / Steam, but maybe I’m missing out.
Never heard of Heroic, I just rock the same setup as you. Steam for games I have there, Lutris for everything else except Minecraft (for which I use MultiMC).