> You can say that about all live musical performance.
No you can’t because the imprecision of each individual live performance is key to the charm of live performances.
However, the author makes very clear that in this particular type of performance, imprecision is by definition a flaw in performance. By their own standards, a single precisely correct recording of any given piece can never be topped by any live performance. The logical end is that for the genre, one only needs one precisely correct recording for any given piece, and all other performance is superfluous and flawed.
This is an institutional mindset problem. Music with creative expression lobotomized out of it having a diminishing audience not able to support its practicioners’ financial ambitions is not exactly a huge surprise.