What's old is new and what new is old. The cycle will go on and on.
Tube amplifiers have been around since 1906 and will be around as long as people continue to make tubes (and they will because they are used in everything including your microwave). Solid state is great also.
Buy what pushes your buttons both emotionally and creatively. Who cares what is the latest's and greatest if it doesn't move you then why bother, just buy a boom box.
This is about what please you not your peers in these pages.
Now I am going to hook up my Dads old Fisher tube amp up to his old Zenith Allegro's and drive down memory lane. You class D will not take me there.