Why would it be difficult? Children can play complex video games and handle the controllers perfectly - why should a manual stick be too complex for teenagers?

Is there something similar for Apple and Google products? I’d also like to set another default browser on iOS and Google apps also force-open their links in Chrome.

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This sounds like “Hmm, maybe calculators won’t replace mathematicians.” to me.

Not sure why it should replace them. They’ll co-exist. Sometimes you can do the math in your brain and for other things you use calculators. Results of calculators can still be wrong it you don’t use them properly.

Not necessarily, if you can easily separate your browser’s sessions via containers: https://addons.mozilla.org/en-US/firefox/addon/multi-account-containers/