Reminders isn't great, but I've never really used a "great" TODO app. Until recently, I mostly used Apple's Notes app for TODOs, and find that it works better than Reminders for my use cases.

My beef is not really with the app itself, but with the ecosystem lock-in and Apple's recent behavior in the EU, lack of true E2EE for iCloud, etc.. I've just started migrating to Standard Notes, and have been trying to reduce my dependency on Apple's apps.