Yes.

And it usually isn't anything as sane as half in the store and half in one other place.

It's like 70% in the store, and 5% in component#1, and 8% in component#2, and 16% in component#3 (duplicating some stuff from component#1 and sorta duplicating some stuff from component#2 with some notes that someone should refactor all this and move those to redux) and the rest of it is only god knows where.

And then there is some hard to track down UI bug because using setState() turns out to be really much slower than you think it is going to be.

But Redux is so boilerplatey and heavy handed that it made sense in each individual case to the original coder/reviewer to not use it.