"to reduce the errors made by the additional amplification"
Nonsense. Why should high power amplifiers have more 'errors'? Presumably you mean distortion.
Fact is the flea-power single-ended single-figure watt valve amplifiers have far higher distortion than properly designed high power amplifiers. In many cases more than 1% distortion compared with 0.01% in high power amps.
But some people don't mind listening to distortion and in many cases say they actually like it.