Why is wet better than using lubricant?

Why does it matter if we use lube over being wet - like, does it matter? you can get aroused but still need some more lube - what's the big deal, it takes 2 seconds??

Using KY Jelly is water soluble. Vasoline is a petroleum jelly, not the best choice.
A woman's natual wetness can dry, considering temp, air movement, fan on, etc.
Oils may be slick and fun, but remember that some have fragrance and a woman may get an infection or discomfort from certain oils or lubes. So KY is the better choice.

Because when your p**y gets wet then not only lubrication happens, but it lips are opening and the tissue inside gets to be full of blood, so it is more sensitive, and more elastic for receiving the d*ck.