First I waited for Kindle Voyage refresh, then started thinking about Oasis, but waited for it to have a normal charging port (USB-C) and now the last reader with physical buttons disappears :(
Oh well, at least my Voyage still works and fits in most pockets (and has cool origami cover), the only downside is that if not in airplane mode, it uses up battery in 2-3 days. In airplane mode I can read 2-3 weeks.