Improving old content instead of adding new

Hi, guys
Currently every new league adding new content. But most of the time it feels unpolished. I.e. necropolis craft, calandra lake, affliction passive trees. They are ok, but can be much better if you had enough time. Also i don't like to invest my time in learning mechanics, which will be removed after a few months. PoE is already vast, better to learn things, wich will be always here.

Instead of adding new content every league, it will be better to improve old mechanics. Like make delve more interesting, add some kind of mini delve atlas. Same for heist, legion, breach, beyond... - they all interesting, but improving it further will be much more cool, than seeing another Sentinels/whatever league.