Agreed. For immersing at home, reading mangas/webtoons with an OCR translated layer and watching Japanese vlogs with dual subtitles has been effective for me.
Agreed.
If there are provider-specific differences then we should be able to add CLAUDE/GEMINI.md to take precedence, but most things in there are basic or general information and should apply to all providers (same for .cursor/, .windsurfrules/, ..)