Mostly, agreed on both counts. Especially for people who need flexibility on the return leg of a round trip, these are fantastic fares. It's basically a $100-per-RT insurance against needing to make a ($200) change. And, yes, not displaying the fare rules at all is terrible, and displaying them only in their horrible, straight out of 1967 all-caps, no line-breaks format is nearly as bad.

But I do understand why they're not publishing them more widely. They're worried about cannibalizing corporate sales of flexible fares. I'm sure a lot of people who currently purchase B or Y fares would purchase an L/FLX given the option to do so through their corporate booking tool. There's really no downside, because you could always update to the Y later if you needed to get on a Y1 B0 flight.

Important note: To anyone who only needs a flexible fare in one direction, keep in mind that the most restrictive rules for the entire itinerary will apply. So, you either need a flexible fare in both directions, or you need to purchase separate one-way tickets. Otherwise, you'll end up paying extra for the flexibility but then also paying to make changes.