I agree with you. I think it happens because the coating is so fragile. Actually, this is the problem. If they are that fragile, I don't want to use them. Even if it is cleaned with the polishing cloth that Apple made and is causing that type of issue, this should not be happening. The result of the correct method of cleaning should not be like that.
Honestly IMHO MacBooks feel in many ways quite fragile and I would not consider taking mine outside the house really.
I use and keep mine so that I never need any more effective cleaning method than dry new microfibre cloth which I use to gently wipe off the dust or mostly use bulb type air blower. If I ever get a spot that needs more than dry cleaning, I use my breath in that spot.
Yes, sure. And I can say that I damaged the screen more, as I see some vertical and circular scratches, as I tried to clean it differently (with some vertical and circular motion), because of the possibility that the marks are not scratches. But it seems that they are :/ So should I put a screen protector first then, when I first got the laptop? Or should I have never cleaned the screen?
I'd say maybe in your case since you seem to need to clean your screen regularly I'd consider screen protector if you can find product that does not cause other problems like cracking screen (I believe gap between screen and chassis/keyboard is minimal and everything you put in-between must be carefully designed for that. But I don't know if those can cause issues for AR-coating, I guess they should be safe but dunno really.
Myself I have gone almost with your latter option, I keep it so that I don't need to clean it more than rarely wipe lightly dust off.
I think that many of the laptops suffer from the same issue, and the owners do not see the problem.
I think 99% or more owners never even look their toys so carefully. I'm one of the 1%, I keep checking my toys all the time and especially when they are new, I spent many hours for looking any possible defects. But not in sunlight, just using very bright led flashlight from different angles and I almost always find some defect.
I clean the cloth with tap water + dish soap first. Then I rinse the cloth with a soft water. So no worries
Actually I worry. I would never use once washed cloth for any display or optical product cleaning. It is fine for wiping less delicate surfaces like computer case and keyboard. Have you actually tried brand new microfibre cloth to check it is not your old microfibre cloth that is causing the issue you see now (I would use something designed for delicate optics or similar)? I'd say washed cloth could be easily causing all kinds of streaks if you look carefully. I would at least try that in small spot to see if there is any difference if you are still trying to get rid of these marks.
Microfibre tends to lock in all the particles it collects, I don't think washing really makes it like new, surely you can wash off grease and such but particles I don't think. Probably even using tap water + soap causes it just trapping more particles even you rinse it with soft water. BTW, what you mean by soft water exactly? Myself whenever I have tried using water for cleaning some part of the display I have used only sterile water for injection use (not the one that contains salt) you can buy from pharmacy.