Not sure why anyone would think that about a dry clutch.
It is generally accepted (on this forum anyway) that the MC21 is an all round better package than the MC28, however both are fantastic bikes.
Buy without fear, although I hope you have deep pockets
If possible try before you buy. If you intend to ride the bike on a regular basis NSR's are a completely different experience to big fat 4-strokes, and it's not for some. In the main those that grew up on 2T's in the 70's and 80's ride the bikes for the experience rather than the investment
What ever you buy check it over, then ride it before you start throwing money at it.

HTH