I suspect this is because people aren't keeping up with the redefinition of the term "fetish" among therapists. For most of our lives for many of us, it meant something depraved, something to be ashamed of because it wasn't "normal". It's in the DSM as a paraphilia, which is something to be cured. There also seems to be a very narrow definition of what it means to have a fetish. I suspect a lot of people here think that it necessarily means dressing or wearing a certain thing to have solo sex each time.
Actually, a fetish is increasingly being thought of as a natural and healthy alternative sexual interest, part of the many sexual interests that people have. We've discovered that not everyone is vanilla, in fact many people aren't, and it's OK ... as long as it hasn't got to the point where it has a negative impact on the person's life, for example if relationships are ruined because of it, or the person increasingly isolates himself in order to engage in the behavior, or it gets to the point where it is difficult to concentrate on work. There are gradients to everything. The very best way to have a fetish in any relationship, IMO, is if both people are into it.
Also, a fetish needn't mean engaging in it to have an orgasm each time. But it IS an alternative interest if it brings a thrill or a euphoric feeling … that little shiver down your spine. Sex is in the mind … like new lovers who reach highs just thinking about each other in the very beginning of their relationships, without necessarily having solo sex or sex together, but who definitely feel that tingle. It IS sexual even if does not culminate in a sexual act. Also we all have different libidos especially as we age, and the natural highs a CDer may feel when dressing may only culminate in an orgasm occasionally. This does not make it any less an alternative sexual interest. But, a fetish IS something people like to talk about, think about, wax poetic about.
They're actually meant for GGs to impress the males in their lives. Women know that men are visual and they want to be attractive for them. And we are not constantly reminded of what we are wearing under our clothes when we have them on.
If we do talk about our lingerie, it is because someone mentions having found an underwire bra brand that doesn't pierce the underside of her boobs, or a brand of pantyhose that won't run the first time they're worn. It does make sense to talk about practical matters in this forum, if CDers want to know which brand is likely to keep the boys in or won't ride up in the back, etc. But I don't think these are the type of posts the OP meant at all.
Also, GGs do enjoy wearing the sexy panties but for entirely different reasons than do the crossdressers who talk about them in a certain way. And as mentioned above, there is nothing wrong with having an alternative sexual interest, so there is no need for the argument, "If the GGs wear them, it must mean they feel like I do, and so why can't I wear them as well".