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.
I use Steam and Lutris (but mostly Steam). Want to get Medal of Honor: Allied Assault and Escape from Tarkov to work, but can’t make them to open 😕 Will try out Diablo IV some day. Have only heard good things about it so far.