I’ve just slackened a Pace RC405 by two degrees using a custom-made angleset, but you can buy them off the shelf. Seatpost angle doesn’t get screwed as it would using a longer fork, drops the bottom bracket slightly, needs a shorter stem to keep the steering usable and it’s made it feasible to chuck a black-boxed 150mm coil u-turn Sektor on the front.
Totally changed the feel of the bike, much more stable downhill, still a really good climbing bike.
Anyway, my point is that with the ability to tweak head angles, you can be a load more creative with frames, you’re no longer stuck with the manufacturer’s chosen geometry – you can modify things to suit your own preference. So you could take a shorter-travel trail bike and slacken it off a bit, bang longer forks on without screwing up the weight distribution and seat angle and so on.
Works Components do a whole bunch of angleset type things to fit various headtube configurations, so you, for example, take a Trance and make it slacker and use a longer fork for a bit more amusement in a way that would be horrid with the original angles.
Anyway, just a thought.