Slate is awesome, but Flutter is not just awesome, it is also very popular, performant, easier to get into, easier to hire people with experience…
I have made a lot of tools for Unreal Engine (not public tools), and i think even though slate itself is amazing it still lacks in some areas like styling, and even though not by much there are other points like:
- I can’t for some reason develop a slate only application by default inside unreal engine, it would be awesome to be able to develop desktop apps with slate without a game viewport, like using the engine editor to manage assets, etc…
- Flutter and Slate are very similar in the way we develop with them, for the slate devs i am sure they would get flutter at first
- Flutter is very popular among young developers, who may be interested in game dev but have no idea on where to begin, i think they would like to know that their flutter skills would serve them well in Unreal Engine
- Flutter has tons of packages, this is something that slate doesn’t have not will it ever i would guess, so anything you doing in slate, you have to do from scratch
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