I was recently watching a yt video about Metallica's live right. They are a band I've always equated with jcm800s in their early days and boogie mk2s from there on.
I was surprised to see how it is all now solid state, axe FX preamps and solid state power amps being the order of the day. If a global act like Metallica has made the jump from all tube to solid state then I think the solid state tortoise is quickly closing in on the tube hare.
What is the element in how a solid state guitar amp sounds that when designers nail it the end for tube amps is conceivable ?
For me the tube amps give a 3 dimensional sound that solid state amps don't. Where the tube amp has the fullness in the low end married to the detail and spatiality of the high end, I've found solid state to sound flat and 2 dimensional. Imo when, not if, solid state amp designers. Solve that issue I think we will see a major shift in purchasing behaviours.
In your opinion what is the last piece of the solid state puzzle that when solved will shake things right up ?