Tangentially to other comments. Though not as prevalent in the 90s as more conventional music software was getting more common also in game music. Tracker music lends it self pretty nicely to the sample chopping origins of jungle/drum and bass.

(I know that for instance Unreal Tournament 99 used tracker music still.)

I was recently part of a jungle compilation for the M8 portable tracker, and got addicted to how fun and easy it is to chop and manipulate drum breaks in the tracker.

So in addition to a feature of the time and culture of the 90s I think lots of music composers were still either using trackers or got started using trackers. So manipulating sampled drum grooves was in their toolsets. (As it frees up channels and is easy to do in a tracker)