Don't understand 3 things about Rolex sapphire

[RONeb]

It seem they are 3 things I just can't get
1)Why don't Rolex use some kind of AR coating on the inside ??
I mean, it cost almost nothing, very easy to do, and can improve the visibility
2) Why doesn't Rolex use convex like crystal ? it is much harder, better visibility from the sides, and tell you the truth - I prefer the look of convex crystal
3) Why don't Rolex put the crystal under the bezel ? Why does it always like 1 mm or more higher then the the rest of the watch ? I think it could be much better under, so it will as some kind of protection from hitting

All of the said above shouldn't even cost to much to implement (I know watches cost 200$ that have all of this), so if I want to be objective it just seem wrong to me