Comment by derbOac

I'm sympathetic to the text file, but for me the problem comes when you have todo lists that you are sharing with someone else, like a spouse. Then you have/want to share and edit them collaboratively.

Simple enough, there's ways to do that, but by the time you set that up to work across multiple devices of your own and someone else's, it's simpler from a UX perspective to just use an app dedicated to that task. I suppose we could use a Google doc or something but there's Keep.

I'd be interested in trying something else — I have tried other things — but keep going back to Google Keep.