@schmudde It pervades the establishment. Back in the long ago days when I was a practicing classical musician — and very young — the first you’d do with a new score was to copy your teacher’s markup … which never (in hindsight) attempted to understand the composer’s intention re phrasing. Just not something that was done.
@schmudde Conductors mostly do worse, which is to leave the details to the orchestra, which grew up with what it grew up with.
I would love to listen to a recording of a rehearsal where a conductor takes issue with the orchestra’s changes to the phrasing or dynamics. Never heard of such a thing.