Just a heads up that all but one of those examples are from THIS century, the artists weren’t even born in the early 1980s!
The Cure is a re-mastered 1981 track, so a better example of what was actually available at the time.
So it’s not necessarily about using only what was available at the time, unless of course all of the example artists only used tools from the early 1980s.
Ether way, it was a great time to be in the studio making music, and I was lucky to have been able to have access to those tools at such a heady time in tech history!
There is one aspect to remember - we weren’t stacking effects because there were only a handful available on each mix, and few tracks on tape to print extra FX. For example, I remember we (Castle Recorders) had two digital reverbs in the early 1980s, the EMP 250 (R2D2) and the Lexicon 224. The 480/Lark came in the mid 1980s. We also had two plates, but they were not in great shape. There were also two delays, a Lexicon Prime Time and the AMS delay. But that was it! And of course I used the SSL Quad Compressor (master bus compressor on the E series), probably with the same settings I still use today!
The SSL had four mono sends and one stereo (cue) send, and we barely had enough FX to fill those slots. The SSL could access individual sends by using the small fader and busses, but that’s really only one more send per channel. And even then, it felt like way more than was needed!!!
So one key to the sound was using only a few FX in total, which is a huge contrast to today when stacking FX is the norm.
Here’s an example from 1986, the very first full major label album I mixed!
Recorded/mixed at the Castle Recorders, by this time we had the Lexicon 480 but you can hear I leaned heavily into the AMS Non-lin2 algorithm on the drums for that classic 80s sound. I was NOT going for the typical “Nashville” sound on any level, being way more influenced by the sounds you referenced in your original post.
It is 100% an “80s sound” but the whole album still holds up today IMO!