It is basically the billionaire/ unrealized gains argument.

I can take a loan against or collateralized my home value.

I can have greater operational flexibility if I know I have a deep financial backup.

There is something to it, even if overstated

You're making a valid point, but not in favor of taxing owner-occupied homes, but in favor of treating collateralized homes as commercial property. I'd be okay with that as long as the basis for taxation is the volume of the mortgage.

Or just making property tax a requirement of leaving your property or accessing any government services and infrastructure

Yeah that’s the Stalinist way of thinking. No, thanks.