Yes, that's true. A track is usually a 7 minute journey itself and anybody can get a a controller and some DJ software and mix one track's into onto another's outro and so on. Thus creating several 7-minute journeys and not a single long one. I do not think the genre is what limits DJs to do more stuff.
My philosophy is exactly that, the tracks are tools, and not always the entire track, sometimes just some part of it. I don't see a whole track as a the minimum unit that builds my sets. And by doing that, I think there are great things that can be achieved. The most easy example I can say is skipping the breakdowns. In the +10 years I've been in the scene, if I have to single out what I think people can't stand of a set is having a break every 3 minutes (which is usually what happens in most psytrance and full-on tracks, a break in the middle, sometimes two breaks). I think there was a thread in this forum where someone was asking "what makes a good set for you?" and the "avoid having a break every 3 minutes" got many points. I can't find it now though.
To me, the idea of creating a set is about extending those different parts of a track, like making a 1 hour track with parts of different tracks. Like, extending the peak high energy part, which usually on a single track, it lasts about 16 to 32 bars (which at 145bpm is just about 30-40s at best). Then right after that, the outro where the tracks starts to come down and where the DJ will usually mix the next track's bassline drop, usually with a bass-swap. And then we're starting over again, with a new track.
But, if you mix a build-up there instead, you can extend that peak and keep the energy high for more than 30s.
So yeah, I'm a strongly believer that for some reason, mixing psytrance has not evolved as much as other genres did.
And finally, yeah, producing is hard and takes a lot of time. It's not for everybody certainly. I've tried it too. You have to enjoy spending days in front of the computer.