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It was common 5~10yrs ago to either have a spare Windows laptop or buy Parallels Desktop for handling bank/govt things. Nowadays, macOS got common enough that some of these ugly programs now have a macOS-specific version. :( Some even have downloadable deb/rpm Linux binary packages.

Some softwares: Yes. People with Mac are advised/forced to use Windows. For instance, Uwayapply, a college admission application service, doesn't support macOS.

Or: they provide .pkg file to install similar program.

Most of them want sudo. They use root permission for various purpose, but the most impressive one for me was registering their CA certificate on Firefox root store, to support WebSocket over TLS to localhost on Firefox.

Nice! That way you can extract the private key and cert from the app and spoof the local server! I bet that cert is valid for *. and the same on every machine as well?

That situation was pretty normal if you used Macs back in the day, for many workflows. Virtual PC on PPC Macs were a godsend in many situations in the late 1990s.