I have read here that p/p tube amps sound their best when they have to work a bit harder , as opposed to a SET amp that sounds best near idle .
Yeah, you will hear a lot of stuff like that. Consider the source: audiophiles. No greater propensity for overthinking, shooting own foot, not seeing forest for the trees, etc, exists.
Anywhere.
So what happens is some guy hears some system sound really good, and... WHY? Can't just be that its a good combination. Has to be some technical reason for it. And being audiophiles, the more technical the better! Even if it makes absolutely no sense whatsoever!
The craziest thing I could think of is to get rid of speakers you like because they're too damn efficient. Now if there's something else you don't like about them, fine then. If you find speakers you like more that are less efficient, fine then too. But to change speakers only to make your amp "work harder" is nonsense on stilts.
Which, again: audiophiles! Bet you five hundred quatloos before the day is out we have at least one saying I'm nuts and yeah you should get some low efficiency speakers, and maybe even tell you drive them with a SET. Because: Audiophiles!
If you like the way your amp sounds with your speakers, great. If you don't, fine. Figure out which you like better- speakers or amp- work on finding ones that sound better. SOP.