Like I alluded to in the OP, the spaces for indentation thing!
For context, YAML literally WILL NOT LET YOU use tabs. The spaces people, not content with beating the tabs people into submission culturally, took it upon themselves to start effectively banning them at the tools level. It really worries me, not to mention being kinda offensive. There isn't even an "ease of parsing" excuse, since tabs are easier to parse than spaces (one tab = one indent level, done).
People have written YAML parsers with tabs support and got told off for it by the guy who came up with YAML. So yeah, it's very much intentional.
-- Frost
Pupdate: TURNS OUT the reason the normal pinyin IME didn't have a simplified/traditional switch like everything seemed to indicate we SHOULD... was because we were missing the
fcitx5-module-chttranspackage!*snootdesks.*
That should really be marked as a dependency or at LEAST a recommends.
-- Frost