Unfortunately for the DIY kit crowd for tube gear thought up and made for sale here in the US. The market has been very tough on these people. I don't know what's left of Kit audio made in the USA. But the one I used went kaputs soon from when the tariffs started. Like so many things made in the USA, it's a thing of the past.
I totally understood what you are saying about the DIY tube kit market getting hammered with tariff that have made them struggle a lot. It is not a good scene at all, and I fear that it affects productions in different ways.
However, I am confident that demands for tubes will always come because there are many of us who would always prefer that warm glow and the hands-on build no matter the cost. The demand is not going to vanish overnight in spite of the challenges so far.