Hey there, @Minskie3211. IMHO, the performance degradation going from 2666Mhz down to 2400Mhz is negligible (10%) whereas the overall RAM headroom is doubled. These days most PC builders are dropping 32GB of RAM into their builds almost as the default. It isn’t absolutely necessary to have 32GB of RAM, but I would personally take that route over having the slightly slower RAM.
No doubt you’ll get a variety of opinions, so take them all in. Blue skies!