I was bummed when I dropped the fork on my then favorite road bike to find a seamed head tube. Not a biggie, but made one wonder what other falsehoods lurked… Nervor steerer was found too. So it goes.
Seat stays are probably the least important pair of tubes in a bike frame. I can see making a case for chain stays.
With a frame that only proclaimed three main tubes to begin with, the issues at hand are not stay brand.