If there was a place I thought reactivity would be weak, I embraced it and I worked on it until I was happy with the results.

but everything they were doing started to make sense

I kept on wanting them to work like Fine-Grained reactivity, since it was much more intuitive.

Vue was always felt contrived for me.

I couldn't land on how I wanted to box primitives. Should I use a getter/setter, or function form like Knockout, or explicit get/set like MobX? These were all ugly.

Because keeping track of your tasks is an intensely personal thing, and people will reject anything that doesn't feel right pretty much instantly.