Interesting that Boulez rated "no enthusiasm". In watching the entire performance (which is quite good, IMO), Boulez seemed frail, as if conducting the work was tantamount to scaling a mountain. By the time of the finale, he may not seem enthusiastic; but he looks like a man who has survived the climb of his life.
Abbado does what he can considering the physical ailments he has dealt with.
I always thought Lenny was embarrassingly over-the-top visually in the Ely Cathedral performance. I certainly enjoy Lenny in his various versions of M2; but if that clip had been called "conductors wetting themselves on stage", it would have accurately described what seems to be happening with Lenny in that clip. Elvis 'the pelvis' in the 50's was pretty mild compared to Lenny in M2.