I do agree with you on that. I think there's a happy path where you keep the high-level architecture clean and approachable, and move the tricky bits out to the edge where only a few people will have to know and care about them. That seems to work out pretty well for PostgreSQL, which on the surface is purely black magic but by all accounts is quite nice under the hood.
There are also a lot of programming language who don't bother touching Python because the team doesn't seem to care about runtime performance as their responsibility. There's a lot of excellent talent out there, and they're mostly being denied and shot down.
[0] https://lwn.net/Articles/754163/