I still can't get my employer to enable this. It's very frustrating. But, big law firm, lots of complexities around changing benefits issues in any way, and it isn't something law firms "have," so.
You'd think with the number of high earners at a firm, they'd love to be able to say that they have the most tax-efficient investment opportunities available to people. Every single associate is in the range of income where mega backdoor contributions would be feasible (though many wouldn't do it, some because of loans, some because of frivolity).