I love and use xfce, but it “just works” for me only ~98%. Window snapping dimensions are oft still wrong, i get visual artifacts sometimes , etc. minor issues. With gnome i may not love everything about it, but i change nothing and it does “just work” closer to 99.9+%
Guile is an embedded scripting and configuration language. Its competition is Lua. Which is unfortunate for Guile, because it's even less attractive there.
The only pro I can think of is you get a standard scheme set of batteries, which isn't even really a pro in this space. The biggest con is implementation size and complexity. IIRC the JITter alone is twice the size of LuaJIT's entire codebase, and not for being vastly better.
License problems too, if you're not making copyleft software. Guile is GPL, both Luas are MIT.
Perhaps, given the target audience and the state of the world, “it goes without saying” applies, or is wrapped up implicitly already thru the mentioned checks and balances (human firmly in the loop, etc etc)
Seems like YMMV
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