With respect, I'd argue the opposite. The new club of high end amps (CH, Audionet, Dart, Gryphon, Constellation, etc.) are at the fore front of SS development and discovery that go leaps and bounds above and beyond all type previous amps evidenced in ultra - realistic, crystal clear, ultra - fast transients, live - like dynamics while providing incredible speaker - controlling sound. Solid state amplification has truly come of age (as has the digital source btw).Personally, I dont care for what I call the 'new' sound like the 1.2 million dollar VAC/Wilson system Ive heard at shows. Its big, bold, punchy, with some detail, but seems to have little of what I call 'finesse' that I hear in my and others, vintage based systems. I attribute it to a couple of reasons. First, the amps of today do not have the quality steel and copper that went into the older transformers. Secondly, the new tubes just dont measure up to NOS ones. They dont sound as good nor do they last as long. Third, (most) speakers are designed to be 'artsy' sacrificing having someone actually listen to them to see how they sound. The system below (mine) won 'Best of show' at the 2014 Capitol Audio Fest. The amps are reworked Altec 1570s with NOS tubes, the pre and phono amps are hand built, point to point wired, and the speakers are reproductions of old theater horns. Not a transistor in the system. They actually sound live music and not reproduced music.
When SOTA SS amp(s) are paired with an equal quality source and speakers the results I hear in systems (I'll add mine to the list) are the closest I've ever heard to virgin playback in a recording studio and to live music. And this, I believe is why I see / hear in most of the highest end systems many owners migrating from tubes to SS. One example - a local friend moved from 2 pair of VTL Siegfrieds to CH Precision monoblock amps and the level of, simply put, realism is astonishing. In particular the ability to deliver razor - sharp transients coupled with equally stunning dynamics made any injected VTL tubey goodness irrelevant and, in retrospect simply inaccurate. YMMV.