Even cheap forks last forever and don't break, The only thing to look out for is putting a bit of grease on the chrome stanchions to stop them from going rusty on salty winter roads.Forks is the one thing that OP didn't have a problem with, so no need to change anything there.
Cars have been developed to be very maintenance-free. It took years and years and probably millions of man-hours to get them like that. Hardly any other vehicle can match them. Even for a good motorbike, you can expect oil changes, brake pads, tyres and chains all need attention during the first year of ownership with heavy use. Whatever Ebike you get, there'll be different things that need attention, and that could be very soon if you're a heavy user.
I've built my own bikes for many years. It gives you a much better understanding of potential failure modes so that you can build in your own countermeasures. I've never had to do anything to my bikes other than mild maintenance, and I've never been stranded without power except when I fell off on some ice about 200 meters from my house and damaged the bike. I was still able to pedal home.
Lets focus on the 1000w Cyclotricity Stealth. It's a cheap way to get a lot of power, but, like a Ferrai, running costs are going to be high. You can't expect a cheap small battery like that to deliver that sort of power for very long. Like a Ferrari, great for the occasional user, but it's going to be expensive if you use it as every day transport. That's not a fault of the bike. You need to conside what you're doing with it and what its design limitations are.
You can apply the same analogy to using a Ford Mondeo for a trip across Africa. It'll shake to bits long before it reaches the other side, so no point in using a cheap Chinese bike for continuous off-road use. Basically, you have to apply a bit of common sense.