Ok my perspective of pursuing something like this in Rust and continuing the motherboard analogy, is that you take on the full burden of developing everything in your laptop onto a single chip (sounds pretty awesome really) but your boundaries can end up blurred as everything is just a single etch. Forcing boundaries by making components with hard won decisions creates a marketplace of exchangeable components. Force everyone to agree on that API by dropping across a hard language boundary.

Your impact is measured by raw performance masked by time in market. Pure Rust or whatever will have higher raw performance but lower overall (my guess) impact because it misses out on a wider market. Python API will have in general a very slightly less raw performance but much wider time in market.