18" will be a slightly better ride with a taller sidewall than the 19", but you will lose some handling ability in trade. Only you can decide what you are willing to give up.
Well, we have evidence of other manufacturers who have done it and backtracked- see the 26 Subaru Outback which now ditched the huge screen and added physical controls for the everyday things. There isn't a way to make a touchscreen which works like physical controls. You will have to look at...
Other than the big screen, I agree. The screen is a big miss IMHO. I seriously would not buy the car (and didn't wait for it because of the screen and the powertrain). I bought a Telluride a couple of weeks ago. Would have considered a CX-90 if I could have found a Turbo S to look at/drive.
This is something that happens with glass sometimes. It can not be 100% avoided unless they use laminated glass all around (maybe you advocate for this?). If you knock a glass over on a granite countertop it will likely shatter and you may cut your hand on it. Is the manufacturer of the glass...