4S Ranch is kind of on the boundary between Rancho Bernardo and RSF. 4S is considered RB rather then RSF because it is composed of tract homes while RSF is generally more higher end.
The animosity you hear on Piggington against 4S is there because… well because it is… I cannot give you a why it is there, but that it is alive and well. However I would say that 4S is IMO one of the neighborhoods that could see substantial depreciation because it may have been prone to buyers stretching themselves to thin when buying a home in the past several years. I wouldn’t say 4S is high end, I would say that 4S is a nice community with alot of professionals in it and alot of tract homes. It is a desired destination for many families due to schools, larger homes, nice community, etc, but it is not what you looked at.
Definitely do not confuse 4S with say Fairbanks or even Crosby, Cielo or even Santa Luz. If you go look there you will be very disappointed if you think it compares to them. It has great schools and is a nice community for sure, but from your previous posts, I do not think it is something that you will find to your taste. Does it hurt to look? Probably not.