Ran multiple accounts, well... used to

I’d like to clarify as to whether the separate steam accounts is necessary or not. My accounts are linked to seperate email addresses and I’ve never had an issue with switching them on the same Steam account. As far as I know, Steam credentials aren’t even looked at when logging you into the game because it works in offline mode. The game has its own login credentials created when you create your character or link your account. Is this still the case, or do I now need a second steam account as well if I want to log my second account in on PC? I currently use Nox, an android emulator, to run my second account, but it doesn’t have the shiny new version.