On the android app I use, switching between accounts is as simple UI wise as switching to different instances (or spaces or whatever the top level division is called) in Slack. In two taps I can switch between tech themed and social themed for example.

I agree some platforms make multiple accounts hard to the point where you're registering multiple free email accounts, installing multiple browsers and using incognito mode, etc.

That is not inherently the case, and can be quite the opposite when allowing users to control multiple accounts is part of the software's design.