I think it might be now wise to carry an "empty" non-Marriott credit card to be swiped at check-in and then make a (formerly unnecessary) stop at the front desk at check-out and switch the folio over to my Marriott Rewards card. Makes more work for everyone involved but at least you won't have to worry about running out of limit on the card that counts, the MR point earning one.
Last summer right before vacation, an auto repair shop blew a decimal place and hit my MR card for $21,000 instead of $2,100. (This is was on a 10 year old mini van and not my Ferrari
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Even though I saw the charge hit within a few days and immediately called the shop to reverse it, it still took weeks to correct. Chase was useless, offered no sympathy and wanted me to fill out many forms. Had I needed to use it for a hotel, I would have been SOL.