In that case I'd say you've never ridden one with a drivetrain set up for you properly. The very notion that the off the shelf gearing can be "one size fits all" is absurd, and because most of these bikes seem to be geared as if they aren't e-bikes, it's one of the first changes I planned on making before I even bought it.
Just as I would with most any off the shelf bike. Off the shelf they're good enough to get you from point A to point B, but it's not going to perfectly use the maximum capability of rider or bike unless you happen to be that "magic medium".
That's the flaw of averages. "One size fits all fits nobody".
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ANY bike motorized or no can be made more pleasant through setting up the chainring(s) and cassette to better match the rider. This seems even more true on 1x -- where you only have one front ring.
It doesn't help that most of these bikes -- from my limited experience at least -- irregardless of price aren't geared to be e-bikes. That "off the shelf parts" seems to take what would be a good for a similarly sized fat bike, and not something with power assist where on the high end there's more room to "push".
Thus the first thing I did with mine was up to a 53 tooth front (from the 44 Aventon said was a 46). And why I just swapped the rear from the stock 12..32 to 11:36 which seems just right for me.
And it's not like it was expensive compared to the bike itself. Especially if you're gonna swap to better cranks like I did (130mm aluminum). $20 chainring, $25 cassette, couple $10 chains, maybe $30 in cheap tools you should have anyways (crank puller, cassette tool, chain tools)
When you're dealing with $1000 bikes and up, this is where even the crappy "cheap" bikes can be dialed in just as good, and even the expensive ones need tweaking.
And where it must be nice to have a LBS capable / competent enough for that... instead of having the nearest one you'd trust being one state over.
It's like dialing in the seat and bars. Not everyone is built for the lean-forward ass in the air crotch-rocket ride that the butt floss seats are designed for. The moment you go cruiser bars and an upright position, you need the wider seat.
Meanwhile the farther forward you lean, the better a thin seat is. But nobody seems to be applying that logic, unable to figure out why if riding upright your tailbone hurts on the thin seats, or if riding with half your mass over the bars a "comfort" seat makes your thighs hurt. Basic geometry.
I'm by no means a bike expert, but even I recognize that you're going to need to hem those pants when you're a 40w:28 and the shortest length they sell at that waist size is a 34 inseam. It's that or run around wearing sweatpants all the time.