Because of lloyds expirience among others .
Who has actual honest (no nonsense) user expirience and he has tried a lot of amps
(Look if you want my honest opinion , SS only goes so far beyond that you need tubes )
But thats not the question here .
Lloyd owned and owns speakers that are the opposite in terms of load of the AlexV and were a lot more efficient. I appreciate a lot his advice, but IMHO it can't be transposed directly.
The only speaker that I owned that was a comparable load to the AlexV was the Aida, it was why I referred to amplifiers I used with them.