Two recordings
As an example of the difference between piano players and guitar players, here are two recordings.
The first is Glenn Gould playing the Corrente from Bach’s Sixth Partita and the second, Hubert Käppel playing the same work.
Try to disregard the difference in tempi.
(There is a way to hear the two recordings at almost the same tempo. Open the Gould video on Youtube.com, click on the gear icon and set playback speed to .75)
Listen to the embellishments and upbeats first and how Gould made them swing, and contrast that to Käppel’s.
In the latter, the embellishments and upbeats are actually out of time and are clumsily played.
So also the 32nd note arpeggios starting at bar 29.
It’s not a question of technique but of musicality.
If a person is musical, he would hear the correct rhythm in his mind before he plays and whether the technique is up to it or not, he would try to reproduce that rhythm in his playing.
And if he were a true professional, if he didn’t have the technique to play the rhythm correctly, he would practice until he could.
This is what I’ve noticed about guitar players, they spend so much time worrying about their precious tone but they couldn’t even do something basic, like play in time.