[tomsem]

Carousel fans, what do you think you'll be missing?

To me, it looks like they are replacing two things that operate in independent contexts but with differing functionality (Carousel in Home contect, and Task Switcher in not-Home context), with one thing (Task Switcher) that operates the same way in every context. This seems a clear improvement and is more like what people would expect if coming from iOS or Android.

To do anything with Carousel, you have to go to Home first, and then maybe swipe to get to it. Conversely if you want to interact with Task switcher, you have to get out of Home context. Arguably, this is not the best UX.

There are things you can do with Carousel that the Fire OS 4 task switcher does not do (Add/Remove/etc via context menu) but the thing one that I most often want to do there (remove from Carousel) is three touch gestures, whereas remove from Task Switcher is one. And for all I know, there is also a context menu in the new Task Switcher to replicate what Carousel used to do (add/remove from collection etc.).

Also, if you don't update, you will miss out on the under-the-hood improvements to Android (better performance and more efficient battery usage). These may be less than miraculous, but every little bit helps.