I think your phrasing of the claim is fine, but
This is actually a statement that I can agree with, build selection precedes the act of roleplaying, loyalty to the first impulse of "my concept is going to be X" is not a part of roleplaying, roleplaying is the portrayal of the character after the selection. Figuring out the character would have problems and choosing to play a different character, or modifying the concept to be mechanically improved, does not have implications for how well I will roleplay that character, I'm not roleplaying less than someone who soldiers on with a worse build. You just sit down, sort out the new concept, and if it really even informs how your character needs to be portrayed in your roleplaying, then execute.