I think I have to concur with the bulk of everyone else's assessment. FR and GH are basically both a "baseline" of "vanilla." ...which I think is great. The fact it gets used as a derrogative has never made sense to me. Vanilla is a great flavor!
Dragonlance, I think, is a bit more than marginally outside of "vanilla" given it's various rules differentiations, but also the customized existing species and new species entirely that are just part of that world. It, generally, holds to the fantasy tropes. The cosmic fight of Good v. Evil. The heroes are heroes, the bad guys are bad guys, "god-granted" magic and sorcery are two separate things, kingdoms/worldly powers rise and fall, etc... but it has it's own personal elements...the "chocolate chips (or raisins)" being mentioned are there. I'd say DL is more like...a basic strawberry. Fresh. Simple. "Basic," some might deride. But a flavor of its own and stuff in it that straight up "vanilla" doesn't have.
Contrary to current culinary trends, something -a game system, a game setting, a [new or revised] class, a [new or revised] species,... an ice cream, ANYthing- doesn't have to be "chocolate ice cream with black cherry jam, fudge swirl, brownie chunks and peanut butter cup in it" to be entertaining or "interesting."
The ever-seeking masses should probably be asking different questions than "Why are all of the ice creams I encounter NOT the chaotic mishmash of flavors and ingredients I like best [or feel I "need"]?" Try, "What's wrong with vanilla? Why don't [or "can't?"] I find just vanilla -or just chocolate or just strawberry- enjoyable?"