Going at ebike speeds can tear up your ass, that's why you see people running ebikes with fat tires, suspension seat posts, ergonomic grips, etc. I've got a bike that can't take tires over 2" and I wish the fork was bigger for that reason.

Not that you can't just comfort the fuck out with an e-bike where weight is no longer an issue but I'd argue you should probably learn to anticipate stuff some ways, too and be able to quickly shift a bit of weight out of the saddle if only for the fact that it's a good skill to have when the enviroment decides to shift you without your consent at some point

Hydraulic brakes are better for the forces at play, and more durable. You can actually flip your bike and eat pavement if you overuse the front hydraulic brake at speed going downhill.

That's true for any well serviced brake excluding dumb shit like spoon brakes, really. Depending on what riding you do and where you park it you might actually want to consider v-brakes because they're a lot harder to accidently bend when parking the thing than a disc.