I love how, in the world of amps, a printed circuit board with that level of density is a bad thing. There is like no possibility of migration in that thing, there is no density at all, it's such a simple circuit that even if it cracked you could easily wire up a bypass.
Should the tube sockets be on the main board, probably not.
I am not saying, in anyway, that these amp makers that were mentioned before don't have great technical/electronics skills. However, point to point turret board is great because if all you can find is a crappy technician to fix it, they don't need to know anything about amps or have great technical ability, all they need is a 25$ multimeter and a 15$ soldering iron. Someone with really bad soldering skills can also make turret board mounted designs look good.
A real tech today should be able to do 60/40, 63/37, lead free, point to point, insertion boards, surface mount, etc.