Great question — answering as the UphillTech team:
That is totally fine. NEC requires receptacles be at a certain spacing (so extension cords are not needed). It does not care if those receptacles are split and half controlled by a light switch. If anything, split receptacles all around help avoid the need for extension cords. I see many homes where the solitary split receptacle is stupidly placed, and you are stuck with a bad placement, or must run an extension cord. You need to be very careful with splitting receptacles. You must break off the correct tabs. If you fail to break off a tab that needed to be broken, you will cross circuits into each other, defeat light switches, or make a rather big bang if it's an MWBC. If you break off one...
Full answer by Harper - Reinstate Monica: https://diy.stackexchange.com/a/108760 (CC BY-SA 3.0).
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