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So not having to think about memory management in a browser pet project is surely the best choice when it comes to a relatively ambitious project as this.
Also of note, Limbo (the language the successor was written is) is also garbage collected, so it's not like it's against the spirit of plan 9. The predecessor language, Alef, supposedly was abandoned in part because it didn't have GC.
Alef for Plan 9 was going to be GC based, and even though it went in another way, Inferno and Limbo clearly fix that error.
Not only it doesn't work in all platforms, they already planned to drop it once, and uses low level dlopen like API.