Yes, people do still ride 28" wheels, me being one of them. This disc-only frame weighs in at about 4 lbs. 9 oz. , not bad for something that can be beaten up for many years.
There are the usual features :Machined head tube , wavy gussets , wishbone seatstays and disc brake re-enforcemement between the stays. I don't like flimsy stuff .
Here's a detail of the disc brake area of the frame and the many welds that make up the structure. I have been welding steel exclusively for about a month now but in two weeks I'll have a bunch of aluminum and scandium to weld up. Variety keeps me happy to come to work, among other things.