I found the (almost) prefect solution if you have an Amazon Kindle, and find the default launcher absolute dogshit like me.

Install the "launcher hijacker" from this repo and a proper launcher like Nova.
https://github.com/BaronKiko/...

It isn't perfect (the default laucher sometimes shows up for a split second when pressing the "home" button), but it really is night and day compared to the default crap Amazon puts on the device.
It's a shame that their customers have to resort to this kind of measures just to make the device more usable.

Only other issue I found so far is that it's pretty much impossible to use widgets in Nova, because it always opens the system settings, but it's not really a big deal for me.

PS:
I am not affiliated with this project in any way, just want to make the life of other Kindle users that aren't aware of it's existence less miserable.