I'll go with the below quote and considering who this is attributed to, with an exception or two, anything anyone else says here is of little merit to me.
"Don't only try for musicality and precision in performance, try all the time as in performance. REMEMBER - NEVER PRACTICE, ALWAYS PERFORM."
I know a few folks who sat in the section with this astonishingly great player and who also took lessons from him and they know this absolutely true.
The quote comes from Adolph Herseth.
For those who don't know who Louis Davidson was, he was the long time principal trumpet in the Cleveland Orchestra.