The audio loops may make decent temporary filler for someone that needs something to take up space while they compose the rest of the song. Otherwise it is somewhat pointless to have them so heavily processed. The midi loops probably have more practical value to the trance artist that would actually use them. I can't say I have ever encountered a trance producer who actually heavily uses loops. Boring arpeggios..yes, but not much in the way of canned loops. These are clearl made for wannabes and non-trance people who want to dabble.
As for people using loops for melodic and harmonic content, most serious producers of genres that would utilize a loop for such a thing is likely to mangle that loop beyond simply looping it. I fully admit that unless I am up for taking more time than I care to analyze a trance song , it's hard to hear the difference, but I feel that way about music. Most genres of music sound like repeated patterns of the same to those who don't care for it. Even most popular genres of music using live instruments follow predictable chord progressions and previously used melodic elements grouped in predictable ways.