The "system" at DCA is built on running and then passing off play action or moved pockets for quick hitters or designated go routes, giving the mentioned receiver the opportunity to make plays. Sneed is largely used to clear out the middle of the field when not in pass pro to open up YAC opportunities for their slants. I haven't watched Watkins yet, but with the yards per catch thing for Sneed, they really only designate plays for him in the red zone where everything spacing related is tighter. Sneed played last season at 6'6/240+ so not exactly sure where the "6'5/205" is exactly coming from.
Sneed is very good up the seams, unfortunately his team's offensive scheme is not conducive of that, which in turn limits his stats, but how they use him opens everything up for everyone else. There's a lot of context needed to those numbers. This is why for the large part, stats don't matter for recruiting purposes (unless they are just straight up bad), especially at a position that needs to be used in a variety of ways over the middle of the field. High School football is very side to side and THEN go vertical, which does not translate into tight end receiving stats unless they are just a jumbo receiver (i.e. Brame). Sneed was very good up the seams and underneath against good competition at the Rivals Five Star event.
At the end of the day, the departure does not really affect Tennessee as they brought in two playmakers last class and 2027 Malik Howard at Oak Ridge High School down the road is the best tight end in the state for recruiting purposes. Always a good thing to have several good tight ends, but not the end of the world. Bill should be able to figure some things out down the road with Sneed assuming both are still there by that point...