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Further info:
JetBlue-operated flights - For travel before 7/20/21, Blue Basic customers may bring one bag that fits in the overhead bin (space permitting for international itineraries) plus one personal item (purse, briefcase, laptop, etc.) that fits under the seat in front of them for free. For travel 7/20/21 or later, Blue Basic customers may only bring a personal item (purse, briefcase, laptop, etc.) that fits under the seat in front of them for free. Personal items may not go in the overhead bin and must not exceed 17" L (43.2 cm) x 13" W (33 cm) x 8" H (20.32 cm). Mosaics and eligible travelers on the same booking and traveling together, travelers combining a Blue Basic fare with an Even MoreŽ Space seat (on all legs, if connecting), U.S. military and unaccompanied minors may still bring a carry-on bag that fits in the overhead bin (guaranteed space onboard for Even MoreŽ Space seats on domestic flights within the U.S., space permitting for others) and one personal item. Blue, Blue Plus, Blue Extra and Mint may bring one bag that fits in the overhead bin (space permitting for international itineraries) plus one personal item (purse, briefcase, laptop, etc.) that fits under the seat in front of them for free. Any excess carry-on bags will be checked bags. Connecting on our partner airlines (including Cape Air) - The carry-on rules of a partner airline apply when checking in to a JetBlue flight that is connecting to the partner. See our partner page for more information. While JetBlue may allow additional carry-ons as a courtesy to customers connecting to our partner airline, JetBlue cannot guarantee that those bags will be accepted for in-cabin travel on the partner. Customers are encouraged to abide by partner's rules for their entire journey to avoid additional checked bag fees if their carry-ons do not meet size/weight restrictions. CHECKED BAGS: Checked bags may be subject to additional fees, depending on the type of fare purchased, route, method of payment, size and weight of bags, and other variables. For checked bag fees and allowances, refer to www.jetblue.com/bags. Other bag rules may apply if your travel includes more than one airline. Please review the bag policies of any codeshare and interline partners on your itinerary.
So based on this, it sounds like Mosaics can still carry on a bag for the overhead bin. I just tried booking a Blue Basic fare because it's significantly cheaper than the next level fare but then it wouldn't let me use points to book an EMS seat. So at that rate, I may as well just book the more expensive fare.