There can be a point between "not enough" rehearsal and "too much rehearsal" that is the right time to record or perform and it is never an absolute time and is still completely dependent upon the musicians, conductor and everything else...
Sometimes this point can't be because nobody(or somebody) involved wants it to be nor are they are the right people for the job at that time and place etc...
Sometimes things get "caught" by recording engineers based on nothing but luck of timing.All points regarding performance are relative to the situation IMO.Sometimes musicians are driven by inspiration to excel beyond their limits.
In addition to time allocated to preparation, there must be a drive,skill and purpose that all involved must share to some extent if there is going to be a great rendition of anything.
And finally, sometimes a technically "good" performance is less fulfilling than a "sloppy" performance if the spirit is lacking.
In short:for greatness all involved must be the right people for the job at the right time yes??
In short ; YES.
Add the amount of pure chance and luck to the mix - it unfortunately is unavoidable.
Lenghty explanation: I would like to share my experience with Scriabin's Poem of Extasy. First, I heard it at friend's on the following recording :
http://www.discogs.com/Scriabin-Tchaikovsky-Claudio-Abbado-Boston-Symphony-Orchestra-Scriabin-Poem-Of-Ecstasy-Tchaikovsky-R/release/3475289
At first, I was shocked that FINALLY there was at least one single recording by DGG that really did sound good in the first place. DGG usually has very good musical performances one "endures" despite lackluster in recording quality. Second, although Abbado was not my prime selection, this one is conviencing.
A couple of weeks later, there was a concert featuring Poem of Extasy in the big hall of the Slovenian Philharmonic, long ago enough to be prior to the restoration (which turned a decent hall for symphonic orchestra into decent-ish hall for chamber music and choirs ) - and of course, I was there.
This performance, conducted by a Russian ( to be exact, in those days Soviet ) conductor was something I will not forget to the day that I die. Believe it or not - it was so mesmerizing, inspired, beyond description, so out of this world - that it took over 2 minutes for the first listener to wake up from the enchantment and start applauding after the last sound from the orchestra decayed into silence ! That first clap of hands then burst into standing ovations for ??? minutes ...
Needless to say, the first thing in the morning of the next day, I was hunting for the Poem on LP records. In those days, in Yugoslavia we did have LPs from the Eastern Bloc ( Soviet Melodiya, Hungarian Hungaroton, Czecho(slovak) Supraphon, East German Eterna, (Czecho)slovak Opus, an extremely rare Bulgarian Balkanton ) and selected titles from DGG, Philips, Decca, EMI, RCA produced under licence in Yugoslavia. Direct imports of Western LPs were scarce and far in between - and were comparatively costly. We did import LPs personally quite a lot, so although the availability was limited, trough "planned and shared" buying of records among friends it was possible to stay informed what is going on in the musical world.
And - BINGO ! - in my hand was a Melodiya LP with Poem of Extasy on it - conducted by none other than exactly the conductor that provided us with such an extatic performance the night before. Without even looking for the condition of the LP ( possible scratches etc ) I run to the cashier's, paid and rushed home to listen to this supposed-to-be-treasure.
! ..
...
- or something like that was the reaction after putting the stylus into the groove. This piece of vinyl earned #1 Dissapointment Recording EVER - for good.
It was lifeless, bland, dull, uninspired performance - or recording of that performance, done in the similar manner. The orchestra on the recording should be much better than Slovenian Philharmonics in those days - yet the overall impression was dissapointing to the max.
Out of appretiation for this conductor, his performance live and his other good recordings, I will witheld his name. That piece of vinyl has been played three times - the first, the last and - the never again.