I would add that only
your core MMF buys and sells are removed. Other MMFs, such as FZDXX, FDLXX, FZCXX, and more do not get removed.
If you hold much in the core fund, I suggest you buy one of the others. In an IRA, FZDXX has a $10000 minimum, but in a taxable account it has a $100,000 initial buy-in. FDLXX does not have that minimum, but still pays a bit extra vs cores. FZCXX is often better if you have state income tax, and you will do what it takes to seek out the appropriate percent that is due to Treasury obligations, and provide that to your tax program or person.
Those premium Fidelity MMFs need to be explicitly purchased, but do not need to be explicitly sold. If you pay a bill, write a check, buy a security, they are automatically and instantly sold if your core is not enough to totally cover the expenditure. So what is in it for you is higher yield, with very little more work.