Roku controls Subtitles/Language as a system level which means Crunchyroll can’t fix it. Other systems allow the language/subtitles to be within respective apps.
Roku won’t budge that subtitles must match language spoken and that each content should be in its primary language (Japanese).
Crunchyroll is “fixing” the issue by creating duplicate seasons - one for each language - but that is a very slow process and it only fixes the dub