Mostly, just using it as an example of why NFE's should just be banned unless they are distinct cases, even if they aren't too powerful.
So you are using Chansey as your example for why Magikarp, Pupitar, Metang, Tangela, and Gabite should be banned from UU.
My opinion is that the Chansey-tier NFEs are the exception, not the rule, and are dealt with using the BL tier. That's what it's for, right? To exclude the overpowered from the underused.
For those who would allow NFEs we would probably ban the offending Chanseys as well. And for those who would ban the unevolved crap like Bagon, no one would use those anyway. So really the fate of all the crap NFEs rests on guys like Gligar and Electabuzz and their ilk.
I'd like to sort these into:Deck Knight said:<List of important NFEs in dispute>
"Distinct from evo":
Pikachu
Scyther
Trapinch
Clamperl
Vigoroth
Obviously no threat/NU:
Golbat
Cubone
Lickitung
Seadra
Tangela
Togetic
Aipom
Yanma
Murkrow
Nosepass
Onix
Roselia
At home with UU tier Pokemon:
Sneasel
Cranidos
Piloswine
Magmar
Debatable:
Gligar (probably OK)
Misdreavus (probably OK)
Kadabra (probably BL)
Electabuzz (probably OK)
Obviously not UU/ban to BL:
Chansey
Haunter
Magneton
Rhydon
Porygon2
Dusclops
So I think the only Pokemon that will be affected are the debatable ones I listed above.
By including the NFEs we get a lot more options to use, and that makes it more fun too. i.e. Pupitar isn't going to be much of a threat IMO, but it might be fun to be able to use a Dragon Dancing rock/ground. There are some surprising strategies that can be pulled with certain NFEs that might be fun to use in UU. By targeting the offenders with the BL designation rather than blanket-banning NFEs of OU Pokemon, we maintain balance as well as allow for more variety in the metagame.