In defense of MC, most airlines that have dropped their sim requirement have other solid methods of determining an applicants value (whether you agree with their testing/interview process/etc. is another discussion). Companies like ATI and ABX...and I'm sure some others as well, do not have those other tools. So, without complex processes the sim can be valuable in filling the gap to determine a applicants value.
ATI & ABX use older simple interview methods of a meet with HR/CP (most of which aren't even trained well on the do's and don'ts), a little online or offline test, and then a sim. No situational based timed scenarios, no psychometric testing, etc.
Hey, we're old school and proud of it <yikes!>