Michael can't do all three at once !
Well even if Michael just stands on stage and does nothing more than tap it foot, than that is performing. Performing can be many things. Secondly Michael can sing and dance at the sametime, he did it in his 1968 Motown audition and he did it in the 1970's and 80's a the highest standard better than anyone. I can't stand this stupid myth that Michael has to lip-sync because it's not possible to sing and dance at the same time, that is only something manufactured acts like Britney Spears and boybands do because they are not natural dancers and stuck in heavily choreographed dance routines. Where as Michael pre Dangerous Tour would break out of choreographed dance routines with his brothers Jackson 5/ The Jacksons and other dancers and the Bad Tour and break out and do the most amazing improvised dance routines whilst singing 100% live with brilliant razor sharp vocals.
I can accept Michael lip-syncing some songs, but he should at least sing the 4 opening songs live, and the last 2 or 3 songs live.