I'm not seeing it. What I am seeing is likely a requirement that has been mostly unchanged since before 210.8 mandated all outdoor 15/20 amp 120 volt receptacles to be GFCI protected, leaving 551.71(F) as redundant text as the requirement is already in 210.8.
The addition of the 240 volt receptacle to GFCI requirements in 210.8 still makes these necessary unless something in 551 would specifically mention it isn't needed.
I don't see it impacting existing installations in recreational parks - they were compliant when installed. It will only impact new installations or replacements. NEC doesn't seem to consider financial impact when making code changes, and it shouldn't.