frankly speaking, I do not see a prob with jet black color as I hardly see people use phone without case. If use with case, what is the worry for jet black?

Unless one is using the phone naked, else seriously jet black is a nice color to own.
Matte black is good color also of course.

As long as dun get the old school silver, gold or rose gold, any color of black or jet black is actually good for a new iPhone 7 purchase.

Both matte black and jet black the antenna is hardly visible especially the jet black comparing to the existing 3 colors which it is very good.