Apologies for not replying in German, martinis have disabled that part of my brain today.
Access to reasonably specified gear and qualified engineers has increased moderately since the 1990's. From my understanding, instruments were relatively inexpensive compared to say, a digital audio tape recorder, maybe an aging reel to reel tape machine, or even something like vintage class-a pre-amps/compressors/channel-strips/exciters/leveling amplifiers/etc.
On top of that, musicians were probably sometimes limited by whatever recording engineer/mix engineer/mastering engineer/etc. they were working with at the time. It's painful to think what some certain Haujobb releases would sound like if they had a better recording budget at the time. But, they managed to blow minds regardless.
Fast-forward to the present day, the Project Pitchfork restored mixes/remasters sound more or less updated, which is fine. It's not like the David Bowie or Depeche Mode remasters that required re-programming quite a bit of insane studio trickery (eventide effects/delays) or tolerating unwieldily, unstable old synths like their old Oberheim Xpanders.
Back to hunting down old dbx 160xt's...