Yes, the problem is that most people simply have no idea about this technology, and believe the fairy tales that the manufacturers or "serious" youtubers tell.
One of the basic misconceptions, as mentioned earlier, is that most people don't understand that you can't hear unused power.
Of course you should ask yourself how much power do I need. A listening test is all you need to find out.
Can I reach the desired volume with an amplifier? Yes or no?
If so, a second question arises to be on the safe side: is the bass distorted at high volumes? If no: bingo.
The amplifier matches the load.
If so: the amplifier is clipping and delivering too little power.
In the case of the A90D, I can say with absolute certainty that it also delivers high volumes with absolute clarity, without any distortion on the Susvara. I have nothing more to say about it.
However, I'm definitely in favor of having power in abundance.
Because how much power you need, depends essentially on how loud and what you hear. There's a huge difference between listening to jazz at medium volumes, and listening to edm at very high volumes.
When I still had the he6se and the fluxlab fa10, I measured how much power I needed.
With Jazz, medium volume, I actually only needed 300mw per channel.
At high volumes with EDM, it was 2.5W per channel!
And again: you can't hear unused power!
Therefore it is nonsense to say that the a90d, with a measured output of 3.7 watts per channel, at 50 ohms, has to little power for the Sus.