I think once the genre becomes defined, it's often bound to get more simplistic if there are words/lyrics. It's not limited to trance music.
A lot of trance music never even had lyrics; listen to what came out before 2000. (Even Tiesto made a lot of music without lyrics before 2002 or so). If you want to find music that sounds like the early days of trance music then you'll more likely find it labeled as techno music today (which is not really all that surprising since trance music originated from techno music anyway).
Beautiful Things is arguably not trance music. Also, when you're studying or trying to concentrate, do you listen to music with lyrics?
Trance ironically enough (including a lot of the stuff Tiesto worked on) is known for having very deep lyrics and that's a good chunk of what people are missing I think when they make the comments like above.
I'd check out Beautiful Things by Andain if you're curious. The lyrics are about a woman who believes she gave up her life and potential to be a traditional wife and is contemplating suicide to end her regret.