Electric turbos are amazing and F1 should push for efficiency, as that's way more relevant than "synthetic fuels" imo.
Something to consider is that as long as cars are fueled for the whole race, engine efficiency also reduces weight. Per this article
In the V8 era, thermal efficiency peaked at 29%. With the introduction of the V6 turbo-hybrids in 2014, that figure leapt almost immediately to around 40% - and it now stands at over 50%.
If efficiency drops from 50% to 40% for example, because of the removal of MGU-H, engines will need 25 kg more fuel to deliver the same amount of energy.
Unless RB keep Yuki in the main team and he keeps getting eliminated in Q1 until the end of season, I don't think it's going to be too detrimental for him. Liam and Max (and to some extent Checo) have already demonstrated that the car is completely fucked, no one will think Yuki suddenly can't drive, and if he manages to score points regularly that can only be a good thing for him.
I think if Ferrari is somewhat ahead and it's mostly about HAM vs LEC, then Leclerc has a much better chance of winning the championship. He knows the team and the car way better. On the other hand if 2025 is as close as last year and 3 or 4 constructors are taking points off of each other, it would be more about consistency and not getting some unlucky DNFs, in that case I imagine it could be way closer between the two.
Expected you to put noodles on her head. Disappointed.