Its all about taste of course. Clearly there is a (large) crows that have problems connecting with a lot of modern psy trance. I think the reason is pretty simple: a lot of it is very generic, the machine gun bassline or the gallop horse bassline are used for 15 years in EVERY track. Also in the track you just posted.
A lot of the old music was very unique and different from eachother, something that is missing in a lot of modern psychedelic trance. I say: most, as there great music left of course, but its rare and its even rarer to hear it on a festival...