Comment by mhast

From what I've seen immediate mode seems suitable for less fancy UI requirements. If you want to start having a framework solve things like animations and such then you'll probably end up with some form of retained mode.

Over my years making UIs I've found most of the bugs you get is due to incorrect state handling in applications. Having a framework you use which is opinionated and helps you solve that is pretty nice. (If your UI requirements are such that you need it.)