But then they lost their ambition - a major point being when they stopped trying to develop their own computing technology and just reverse engineered IBM chips instead.
I rather say, it has to do with economic realities: there was a joke in eastern germany something like:
we got no toilet paper, but a cosmonaut, hurey.
edit:
"Keine Bretter für die Laube
Für das Auto keine Schraube
Für das Klo kein Papier
Aber Kosmonauten haben wir"
non rhyming translation:
"No wood for the hut
no screw for the car
no paper for the toilet
but a cosmonaut we got"
"A rat done bit my sister Nell. (with Whitey on the moon) Her face and arms began to swell. (and Whitey's on the moon) I can't pay no doctor bill. (but Whitey's on the moon) Ten years from now I'll be payin' still. (while Whitey's on the moon) The man jus' upped my rent las' night. ('cause Whitey's on the moon) No hot water, no toilets, no lights. (but Whitey's on the moon)
-- Gil Scott Heron
However there were alternatives: once in office, Beria made an effort to get rid of East Germany, in an effort to end the cold war. However the rest of the polibureau ousted and executed Beria, because they feared that all this was too destabilizing (then they got the Hungarian uprising under Khrushchev, which was much worse; also Krushchev later fired his co-conspirators in the coup against Beria - Malenkov and Molotov) See: https://en.wikipedia.org/wiki/Lavrentiy_Beria#First_Deputy_P...
I am not entirely sure about it, but the question of who is on top seems to make a big difference, when talking about a very authoritarian political system.
The RBMK wasn't an horror, it was simply meant to exploited in a certain way, and containment was integrated. At the Chernobyl plant the guys committed a serious boo-boo (the very possibility of a disaster is common to all designs, there is no absolutely full-proof design, especially if the guys can shunt actuators/fiddle with captors/whatever).
"According to the Soviet experts the prime cause of the accident at the Chernobyl NPP was “...an extremely improbable combination of violations of instructions and operating rules committed by the staff of the unit” [3]. This conclusion sets a full responsibility for the accident at the Chernobyl NPP on its staff. Participants of the Post-Accident Review Meeting [2] also accepted the Soviet version. However, it was incorrect. This was demonstrated in 1990 by the commission of the State Committee for Atomic Safety Survey of the USSR which concluded that the main reasons of the Chernobyl accident were serious shortcomings in the design of the Chernobyl reactor as well as inadequate documents regulating a safe operation of the reactor [4]. Various errors, that were made during the turbogenerator testing by the personnel of the fours unit of the Chernobyl NPP, according to the commission, could only contribute to the development of the accident."
https://api.semanticscholar.org/CorpusID:1490526
https://www.rri.kyoto-u.ac.jp/NSRG/reports/kr79/kr79pdf/Malko1.pdf