Amp discussion, class D vs retail

Hello good folk,

I recently bought an Anthem MCA gen2 power amp.
Today I discovered brands like Hypex, Purifi, and ICEpower.

And there are companies like Apollon Audio and Audiophonics who assemble them.

I ran it through AI, and it basically told me that a 3-channel amp from either of these would completely blow away my Anthem, and at either 2/3 or half the price.

So I am now sitting here feeling incredibly stupid for buying an amp that was really expensive in comparison.

But I also wonder, if these products are so much better, why are they not mainstream?
Why do some people still prefer ATI etc?

Also they seem to weight a lot less.

So, you all you experienced hifi rats out there.
What am I missing?
Was the Anthem 325 gen2 a bad purchase for my Dali Opticons 8 mk2+Kef R6 meta?
Should I use Hypex, Purifi, and ICEpower,/audiophonics when assembling my future TV set up?

Have an amazing day and thanks for reading.