Paralleled Transistors

Short answer: no. Everyone parallels devices. Also paralleling them is not really related to complementary pairs (NPN and PNP) which are used to achieve DC coupling to speakers. Which almost everyone does.
Exceptions: tubes and some really oddball, very low power FET amps.
I’d argue that if you want to go to the trouble and cost to parallel up a gazillion devices, you could get some theoretical benefits. Nelson Pass certainly thinks so.
G
Ps: after posting this i saw that Nelson's name was being bantered about above, but for the opposite reasons i was. Nelson once designed, or tried to, a power amp using hundreds of tiny N-channel JFET TO-92 devices that he really liked.
pps: In sane-land, i recently completed  a design for a headphone amplifier with no loop/global feedback. This adds to the output impedance issue noted above, but is inherently stable into any load (including some crazy impedance 'phones). Among other things, it parallels quite a few to-92 NPN and PNP devices to achieve power handling temperature margin, and linearity. And it just rocks.

I wonder if someone can briefly explain why my high power class A Clayton S-2000 amplifier draws 6.2 amps when first turned on and then drops to 4.2 amp draw after 25-30 minutes....perhaps it is stabilizing its class A bias?

That is kinda strange, i would be normal to be very high for 1-2 seconds as the inrush charges the capacitors int he LPS, but 20 minutes must be some kind of system governance. I would venture a pure guess: i runs very high bias until it hits a thermal level and then the bias is turned down to protect it from excess heat or possibly thermal runaway.
My designs employ a thermal loop as well, but it constantly hunts within a preset range - no big jumps.
G