F1 has never been about all out speed, and the large capacity NA engines are from an era the world no longer lives in. F1 had to shift, and the direction it went was the right one, but the way they have done it is shockingly poor.
Totally with you in endurance racing being the natural home for hybrid tech however. I remember when Porsche first wheeled out that 911 RSR Hybrid with the flywheel in it, and nearly won the N24 because the spinning lump of metal in the passenger seat meant they could go 1 lap further on the same amount of fuel as their rivals.
F1 tech is impressive. They are faster than before and are using 30% less fuel. The problem is nobody knows it. The sport is almost embarrassed about it. WEC on the other hand has bolted it's hybrid tech right at the forefront of everything it does so nobody could be in the dark about it.
The funny thing is, nobody is moaning that WEC is rubbish with this tech and should return to it's 'old days' like they are with F1. Instead everyone has embraced it. But they are the same thing! The F1 V6 power unit complies to the ACO regulations. You could bolt a Mercedes F1 engine in the back of a LMP1 chassis and go and win Le Mans. Do you think everyone would tell them its a waste of time and is rubbish and they should have used an NA V12 instead? Of course not, we'd love it!
The technology is not the problem, the way the series its used in promotes it is. WEC is brilliant at it, F1 is awful.