As to wheel chairs needing that rise, if they do they're poorly designed.
Given you've never designed or had to use a wheelchair, your assertion is not very convincing. Making a wheelchair that can go up steep gradients is going to have lots of knock-on effects to the design like weight, size, cost, and since you can't push yourself up such gradients with your arms for any length of time it would be a waste anyway.
I told you, I'd be happy to carry you into the store myself. I'd be happy to push your wheel chair up my ramp. No need for anyone else. I would do it gladly.
Let's assume for a second that you really are that nice (hard to do based on other things you have said, but OK). Do you think it is important for a person to be able to live with dignity? What dignity could there be in a life where you have to ask someone to *carry* you every time you go into a shop... multiple times per day. You would have to find a fine nice person like you to go out of their way *every* time an obstacle is encountered, which in your world would be pretty often.