As the proud owner of about 4-dozen discs recorded live at Bayreuth (including such classics as the Böhm Tristan und Isolde, the Keilberth Ring and the Furtwängler Beethoven 9th symphony) I'm certainly not going to say anything negative about the RESULTS of the Bayreuth acoustic. However, particularly when performing opera, the venue requires a little extra directorial attention. From the conductor podium in the pit, the leader has to deal with singers he can't directly see [I understand that some have employed a variant of the 'rear-view mirror' assembly for this], and sound-decay rates that vary even more markedly than the standard conductor-placement.
Georg Solti, though publicly grateful for his brief work at Bayreuth said something like if all houses had the demands on a conductor's concentration that Bayreuth had, he would have never stopped studying medicine, and would have become a doctor!:lol:
Interesting