I don't think a 'proper' driver would do much more than Perez already is tbh (I believe Perez is a proper driver). As we have seen with Perez, Max haters aren't long in deciding that actually driver X is no longer proper when the results aren't bearing out their presumptions. Perez was fairly proper before joining Red Bull IIRC. I'd like to see them put a top tier driver in the other seat (something over and above a proper driver). But there are reasons against that too, and they're not just 'Max wouldn't want it'. Obviously I think Max probably wouldn't want it in an ideal scenario, but I'm sure he'd live with it. While Max would inevitably still win the intra-team battle, the other driver would get a larger share of the points pie than a Perez or a Sainz/Gasly/Albon would get, and therefore unnecessarily impact on the WDC race, if not the WCC race. As you say, it's currently the perfect scenario. Not just for Max, but for Red Bull. Why on earth they'd try to rock that boat I don't know. They have the best driver. Keep him happy and he'll win you titles.
But I can't shake the feeling we're on a precipice at the moment. One that will probably remove Red Bull from the top over the next few years, or at least it'll give F1 a huge shake-up.
The irony is, last time there was a big engine shake-up, Mercedes shot off into the distance and weren't seen again by another team for about 6 years. And who has Max been linked with recently?
Yep.