Flexible (as in time signatures) literally means the opposite of one single entry for the whole machine.
That was (re-)posted on MPC Forums last year on Feb 13, and it's now almost a one-year anniversary.
I mean, Akai... the new machine has what, 16 GB of RAM, amazing... but you can only set one time signature for all possible sequencing parts on that huge amount of RAM. Own it! Fix it! Do it!
And also for "Gen 1" while you're at it, please. I think it's due.