For push-notification login, there is really no other choice beside the proprietary one.

But they do also provide universal TOTP for 2FA login, it does work with other apps too. (unless your org had set special 2FA rules) The alternative option is not so obvious on initial onboarding IIRC, though.

You can NOT use effective adblocker extensions with manifest v3, as it removed functions that they need (and impose some other limits to make them unable to update fast)

Non-JP version games “might” work, but will force to shown in Japanese (if available)

Japan-only version: Only support Japanese language, JP Nintendo account, and probably Japan payment methods for shopping.

Multilanguage support version: Doesn’t have those limits, but it’s more expensive.