Shame I missed the twitch stream, any chance of getting that uploaded anytime soon?
smallB, you are coming across really ignorant and naive.
If you don’t want the engine to be a toy, stop treating it like one, don’t update blindly without revising the changes, it’s used for AAA production, you being a subscriber comes with the luxury of a far more open and transparent development cycle, treat it as a benefit, not a burden. In games development you will rarely update if ever unless you needed a key feature, but would still do it cautiously… Navmesh broken? Fix it, be a professional. I work in a games company where the engine breaks far worse and more frequently than UE4, UE4 IS one of the most stable game engines out for public use.
To claim an update broke the engine as a general term is a bit too general when only navmesh is the issue, a bug, they will happen, like you said.
Back on track to all this drama and pages of unnecessary amounts of miscommunication, I think your intentions are in the right place but your presentation in your wording is attention seeking, the impressions you give off saying “toy” and “Very unstable” is far too generalised, you could just say 4.6 navmesh is broken when is there a fix? Rather than declaring the engine unstable and broken. (I don’t use Navmesh, the engine is not broken for me so your generalisation is misplaced and makes me question your wording).