I’ve been a developer for 18 years and I have to agree. UE3 was fine. UE4 was fine from 4.6, when it started to be usable, to 4.19, where there were a lot of unfinished features, but at least after two years they finished the layered materials 
And UE5 is fine, but they making new experimental features, but dont polish almost anything and lack of documentation.
But there’s no point in telling them. You try wrote it here, then on udn and they just care. In fact, it will later demotivate you to work, the engine becomes more complex, and Epic is proud that it has recruited a lot of inexperienced people. Just mess without logic.