Is there any truth to this question?

Pass gets mentioned a lot in discussions like this.

2 gain stages simple enough for 'ya? I've read thru his DIY stuff and many amps are simple 'scale ups' of a basic design. More output devices in parallel with minimal matching. Increased PS size / capacity / output heatsinking.

The Pass amps, at least the 'a' amps, avoid certain distortions (crossover) by using a different, highbias design than a/b. His 30x2 'a' amp has something like 20 output device pairs per channel.

I think more important, perhaps, or at least on the table, is degree and type (global or stage-2-stage) levels of feedback. Amps with multiple gain stages can suffer here.

Clipping distortion is awful and enough power should be provided to avoid it.

Personally, I have one of the large 'd' amps of 250x2@8 which doubles up into my panels. I doubt I've ever got the amp past half that on peaks....and 1/10th that in rms.

Glad to have phase drug into this discussion.

also needed is the fact that while same-power amps will make about the same amount of heat driving a resistor, the same can not be said when driving a reactive load. That's when people start talking about 30 watt SS amps weighing in at 75lb.

So, the Harbeths with minimal phase shift are an easy load, regardless of the overall sensitivity of the speaker.
Similar comments can apply to my panels. Reasonable phase angle, low sensitivity and well coupled into a room make for a reasonable load which any 4-ohm capable amp should drive well. The conventional mo-betta' panel power wisdom may not be 100% accurate.

I like 'the amp of the month club'. Never joined, never will and couldn't pass the physical!

However, given 2 identical impedance measuring speakers....they will react very differently to the same amp based on::
1. Phase data for the speaker. Reactance kills
2. Amps ability to drive such reactive loads.

To your last point of 'how much power is required' please add speaker reactance. Just my opinion, but the 'low impedance' / 'low sensitivity' = bad load thing has been repeated so often that as wrong as it is, has become a form of truth.
A dozen or more posts back, somebody drug Harbeth into the discussion. Low sensitivity? yes, in general. But easily driven by a 50x2 tube amp. The Harbeth? generally low reactance. 'Tube friendly', perhaps.