They knew this was gonna happen. What's stopping them from releasing events or races instead of a league?

First of all, I appreciate the transparency, I hope GGG never changes that (even though they could have let us know that earlier).

So obviously I'm no game developer but I feel like since they knew this was gonna be complicated, planning an old event they've done in the past can't take that much resources right? Races, gauntlet, delve, legacy league, etc... Like give us SOMETHING doesn't even need to be new content.