As for needing to maintain decorum in shomayim, that’s all over the place in chazal. Malaachim must stand at attention and not “sit”, whatever that means; elisha ben avuyah saw Matat sitting, and thought it was shtei reshuyos, etc..
There is an entire chorus of malaachim who are commnaded to honor Hashem in varying ways at varying times…kovod and etiquette is crucial.