Horseshit. Nowadays, sure you win that argument in most cases. In the 60s no. Even in the 80 and 90s some of the best albums of those eras were recorded in garages or apartments.
There is sound engineering in live performances (where a band really wins me over) but 80% of that is from the musicians the rest is acoustics / audio engineering.
Any album that was recorded in a garage/basement would have been sent to the studio for mastering, and approval by the producer, BEFORE being released...Even then they weren't as clean as a studio recorded album
Today live CD's are much better, but that's because of the audio equipment on site. The band just plays, and the sound man and engineer level everything out
That's why when you play live, they want a stage plot of your band. That way they know where to place mikes, what will go directly into the sound board, how many mikes on the drummer etc
The simple fact is..Any technological advances on Beatles albums were due to Martin and the Engineers..Not the Beatles. They were great musicians, but in the studio they were outranked by what Martin wanted. They even had to audition for him before he agreed to take em on..
I have a studio version of "I feel fine" before it was mastered and edited..You would think it was done by 8th graders