Well, again, in my opinion it's a very good one
Yep those 12BH7's are beefy little chaps and well suited for the job.
My guess on why folks ask about a smaller cap is that they're wanting to put some dielectric other than an electrolytic in there based on, fashion? preconceived notions or... ? A 22uF poly cap at the voltage needed is big and/or expensive hence.. Just a guess.
I imagine one of the reasons your 10K61 output transformer works really well here is the combination of the
low driving source impedance from the totem pole, along with that 22uF cap. The resonance in that whole RCL loop now being able to be parked well below audio.
Neat trick on the input pentode too with sourcing extra current via the 30K for
raising the input overload capability (I think?) by the way.
Edit: Actually, I'd not looked at it in a while, but your negative feedback scheme is really quite a bit more sophisticated than first meets the eye!
The 30K looks to be ensuring the correct 2.5V cathode bias on the pentode.
But I'll need to do a couple of sums to see exactly what (how) you did (things) regarding the gain. 30K and 3K3 is only 20dB, but your amp has... 28dB (less the 10K61 transformer's -14dB and a bit) for, 14.5dB total in to out so...
Anyway, nice circuit all round