Mosfets: The way to go for SS amplification?

Thanks, everyone: as a layperson w/limited time to devote to the hobby, and VERY limited science IQ, I depend on my "friends" for help. Amazing what Nelson P has accomplished, BTW: can anyone beat this guy's electronics résumé? (Ez: if reading books would help, I'd have gotten a degree in a scientific field, and not gone through employment hell through these many decades; if we all had the time/innate ability...this forum would vanish!) Happy Holidays!

IMHO, it's not necessarily the parts, but the sum of the parts that matters.

A lot of folks think using mosfet drivers and bipolar output transistors give you the best of both worlds. McCormack and Theta are just two prime examples. People use to gripe about the mosfet haze but I guess times change. I think Jfet's are used more as an input amplifying device. I know there impedance stays constant over a wide range.

Hafler claims that MOSFETs have several advantages over bipolar transistors: better thermal stability, faster switching speed, lower output impedance and better linearity.

hafler monitor

From Stereophile December 2002: Musical Fidelity uses bipolars because "they have a higher current yield than mosfets".

If the Plasmatronics are the speakers I remember seeing, won't they set the tree on fire? Aren't these the speakers that needed a gas supply to run? Or was it that they emitted a gas from their plasma tweeters?
Happy Holidays