I can't talk about Einleitungszeit without being biased. Now that Freak Animal is as recognized as it is, reissues on it would likely be the best possible scenario.
I've been working on a CD reissue of Aus der Leichenkammer for several years now. The original push to take it to CD was to make it louder, and to obviously expose any of the fidelity that was left on the cutting room floor. It's a very heavy, dense, low-frequency album with some interesting upper dynamics (I think it is far and away the best album from that period of exploring low frequencies). The main complaint, all along, was that the mastering was too quiet. It required too much volume knob during playback. When I'd received the DAT master back in 1996, I only had a few hours, on a single afternoon, to listen to it before sending it off for vinyl mastering and plating. I thought the vinyl mastering was the reason for the low volume, but in fact, it was originally mastered at a lower volume than normal. It isn't the vinyl. It's the master. After hearing the DAT>CDR transfer, I lost a lot of interest in reissuing it on CD. A CD version would flush out a bit more sound quality, but not as much as I thought it would. There are enough vinyl copies out there to handle the demand, and to be honest, after having tens and tens of more listens to compare the LP to the digital master, the vinyl mastering is high quality from a fidelity perspective. I wasn't always confident in that, but now I am. I was also once under the false impression that a 2LP would've been better for the material than a single LP. While probably ultimately so, the material wouldn't have benefited that much from going with a 2LP. I'd have to check my records, but whoever I had master that record did a fantastic job. It's definitely the most demanding material I ever released, and they did the master great justice.
The first three cassettes are still my favorite releases from them, but it might not be fair to say they are also at the height of their skill. A couple of the newest albums are amazing in their own right. To my ears, the two lowest releases are Kremation Gesch Lechtslos and Aus Dem Laboratorium, the former being the worst of them all. Everything else is gold.