Simple amp to build

Ok, So I am looking around for a simple amp project as a fun build.
And I came across this page https://sound-au.com/project12.htm
And it got me thinking.
The last version on that page could be nice I think. Easy to stabilize and enough loop gain for decent THD specs.
Why is this simple input arrangement not used more often?
I always see the LTP in VFB amps or the basics of a diamond buffer as used on CFB amps.
But why not a single transistor?
The only downside is that it can't be DC coupled.
Using more modern output transistors could make this amp more then fast enough also.

Just some thinking.

Any ideas to improve it further are welcome.
Also any other simple amp projects are welcome.
 
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Hello, I developed very recently this amplifier, I will go make it available alongside with my other modules next month.
It is very small and simple uses lateral mosfets for output doesn't require thermal compensation, although input stage
is with a diff pair.
Or you could also take a look at my other audio amp modules here:
https://www.ebay.de/usr/rocksandsound