That would make sense, however laws generally don't require common sense to be enacted. LOL
California has a lot of trails - the popular areas frequented by a lot of mountain bikers, where ebikes are not specifically allowed, are where the conflicts arise. Regular mountain bikers REALLY don't want ebikes on 'their' trails. And the USFS still classifies ebikes as 'motorized vehichles' and thus are prohibited on hiking and biking trails. BLM and Federal Parks have opened up their areas to ebikes, except where specifically prohibited. This followed the order that came down from Washington DC last year.
The less popular areas are simply not ridden much, nor patrolled, so you can get away with riding an ebike in those areas. If LEO catches you, or someone complains, you may well get a citation, or simply be asked to leave the area.
And all of the routes and trails that ARE open to motorized - ATV's and motorcycles - allow ebikes. So lots of USFS routes are included in this - thousands of miles.
What is sad to me, is the push-back from mountain bikers on ebikes. I get it, they've lobbied and worked hard to get access to hiking and equestrian trails, and their fear is not so much the Class-1 ebikes, but the people that will take Class 3 and more and ride them like motorcycles. And any area where they have access that is not specifically allowed, more like grandfathered use, that is at risk of shutting down, the fear that ebikes will exacerbate that risk is real.
OTOH, all of the arguments for noise and speed are hogwash - simply defenses. The fear is for people that will abuse their access with over-watted bikes and risky behaviors.
I'm on the cusp of buying a pedal mountain bike for those trails where ebikes are prohibited. It just opens up new riding opportunities and access. Best of both worlds. Besides, I can get wifey to haul my a$$ up the mountain in the pickup so I can ride a pedal bike down.