I will re-iterate the video you showed was very informative! I still cannot stop thinking about it.
Hardcore roadies, MTBers... A cult.
It is easier to live in the gravel cycling community (at least here). There are very few gravel race organisers in Poland who actually demand riding "true gravel bikes", that is, ones with the drop handlebar (some do). Usually, you can ride any bike you want as any type of a bike has its pros and cons; it is unheard of a rider of anything else than a gravel bike ever won a gravel race. (Yes, there was a single occurrence when a rider of an endurance road bike came the second in an ultramarathon).
The atmosphere on gravel group rides is relaxed. People wear and ride whatever they feel is comfortable and no one gives bad or funny looks. See me: I ride e-bikes an no one has ever rejected me from a gravel group ride

Moreover, more and more gravel cyclists I know either had some contact with or even own an e-bike!
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This young MTB chap would've smoked us all if he only wanted
Three fun facts about our latest group ride:
- As the guys were inspecting my Wahoo ACE at the restaurant, the owner of a Wahoo Roam 3 was playing with my device. Suddenly, he shouted: "Is your e-bike battery almost empty now?!" to which I replied "Yes, it is below 20%!" -- "What will you do now?" -- "I carry a spare battery in my pannier..."
-- to which everybody laughed "A cunning guy, you!" 
- We were riding a gentle downslope, everybody accelerated. Untypically for me on descents, I started pedalling hard to keep up with the group. At a point, my Vado stopped accelerating! Why? Well, I rode past the 45 km/h motor cut-off

- As we started climbing a steep flyover, I even didn't touch the assistance mode button but dramatically downshifted and pedalled at 128 rpm with the burst leg power of 428 W. My Vado accelerated to 30 km/h uphill, I took the group over, merrily yelling: "Cadence is the King! Or, the Queen!" -- how they laughed!
