I understand your question, but let me try to explain first my position.
I always had bikes (mtb & road), and when we were a smaller family, I usual do my work commute back home, on my road bike (around 25miles / 50km). On a normal year, I would do between 10Kkm and 12Kkm.
My MTB rides, were normally hard, being fit, and usualy alone, because no one had the fitness, and waking up at 700am on a Saturday, I wouldn't like to do on the same time ½ of the distance. I enjoy the social, but at that time, was looking for some connection from mother nature, and accomplish hard stuf. Usual ride would be around 40km and almost 2.000m.
Back into the present, with a larger family, not being able to commute on my bike and having limit time to maintain the fitness, to enjoy the same thrills as I was used to, I would need an ebike,
With the ebike, returned the social riding, it was easier to have fellow mates on a ride, and all would do the +35km, +1600m.
Until... I get bored!
You can ride ebikes and get tired (less assistance or faster, or both!)... but it wasn't the physical aspect, that was making me bored.
It seems the challendge wasn't there anymore... even if ebikes permits having lots of fun on the climbs! Not only on the descents...
So I started moving away from my usual trails, and discover trails, that lead me moving away from the mountains trails, climbing less, and discovering more distante trails.
And it was something else! Similar as my Enduro moto, where you follow a trail, and basically get lost in the woods.
Sure I needed a GPS, but I wasn't following a GPX. It was a bit of freedom!
If there were no passage, I would return back and go for the alternative.
This new way of riding, has pushed me on having more and more fun, and also permited adventuring on my MTB on these trails, knowing before hand that I wouldn'T need to suffer if I was wrong, nor did I would need to follow a GPX,
Both are different, emtb and mtb look similar, but are to diffferent things, being the emtb a machine closer to an Enduro moto, but with more physical demand (this is not linear... but i think you get the idea).
I still have my bikes alonside my ebikes and Motos.
Would I sell any? Probably, time is scarse and limited, so Imdon't use so much each. But having the option, is something else, and never came home thinking how hard I had to push on that climb...or anything!
It's a known factor, you just need to embrace and adapt!