Trelja, IM(H)O, you need to step back a couple of paces and look consider how most audiophiles would see this:
The fact that a triode makes 20-30% of pentode power means to most anyone that if you have a pentode amp of 60 watts, if it was then wired in triode, it would make maybe 20 watts. Similarly, if I say that UL makes most of the power of pentode, while approaching triode linearity, its not going to be skin off of anyone's back to find out that the result is about 40 watts, which is 'most' of 60 watts, since 40 watts is more than half of the power. We're not talking rocket science here; its pretty common to trade off between power and linearity.