TickTick
A productivity app I've started using recently. And I realized it's almost what I was trying to build in Notion from ground up a few years ago.
No wonder the maintenance overhead was so high that I couldn't get it to keep working properly. In fact, I had switched to Google Keep in search of stable waters.
If you want to go to the Moon, become an astronaut - not a rocket scientist.
PS: Just found out MKBHD 'keeps coming back' to this app too. Do check it out.