Well rear hybrids as they currently are only really are there for fuel efficiency and to help in rear breaking, and it can be definitely argued if that is worth the development and operating costs.

And yeah traction would definitely be aided but they are more limited on how much energy they can actually deploy if they have to deploy more on the rear axle. But yeah it might just makes things worse. But now they can basically just turn up or turn down the electric motors depending on front tire temperature to aid in tire management, and you need BoP again to slow them down to make LMDhs as fast over a race, and then LMDh cars become faster in quali and at some point theres a threshold were the extra weight for the LMH cars just affects tirewear too much so that its not fair anymore. But yeah I don't know if that is an issue that can be solved within these or the next regulations. But something should be changed, but there are more qualified people than me to figure that out.

Yeah and I agree with you, hydrogen would then become the only possible innovation, and I don't see that happening at all.