You can barely find a New Q5 Home today . Actually I don't even think I have seen any new Q5 built in my county any anymore. Those are built in the Country and financed through USDA/FMHA. Way back the Roof Rafter span were often 48" now 24" 20 Year Shingles. They used Masonite or wood lap siding. They had minimum kitchen Cabinetry and counter top was barely enough for the single bowel sink. They only had one bath Sink, toilet and a bath tub Cheap 4x8 Paneling. Cheapest Grade of Carpet and Vinyl. Interior walls were that Cheap 4x8 laminated Paneling. Formica Counter Tops. The One Bath was limited to a single shallow Sink and above a small metal medicine cabinet with one door that was also the mirror. So Yes we will still get some assignments that are Q5 but they are not New construction like the OP's Townhomes. Now Standard industry roof rafter spacing is 12”, 16”, 19.2”, and 24” on-center.
Your point about Q5 above OLD, Poor Condition. Yep. Q5's require a lot of maintenance and replacements; Carpet, vinyl painting etc etc
Like I said above I don't think any Developer/builder are even building any Q5 let alone Q6
Q6 is almost non-existent. That's the good Ole Country Boy with limited money who has some tools and his one acre of land.