In ~2017 I did a contract with Ericsson, in their offices they had no assigned desks. Some days you'd show up in the morning and find another team had moved into your space, claiming that some other team had taken theirs. In those days we became desk refugees, wandering halls to find/take a space large enough for the team.
The next stage, that we reached around 2016/2017, is "we're running out of seats; everyone should work from home one day a week to alleviate the problem". Good when you're at home, but the rest of the week becomes even more chaotic because you can't predict what the available seats will be like day-to-day.
I'm fine with this. I'm surprised that airline seat manufacturers don't make versions for office use -- business class seats are much nicer than any open plan desk I've ever sat at. You are fully surrounded on all sides, your chair can turn into a bed, and inside an office you can probably stack them. Getting a couple of 30" monitors in there that are infinitely adjustable would be a challenge, and cleaning it sounds like a pain in the ass... but I'm sure these issues could be resolved if there is money in doing it.
I think people like open-plan offices because they're easy. You move into the space, have IKEA deliver a bunch of tables, and you're set up. It's cheap and it's easy.
After a while you get to know that this spot - letter "E" and "Backspace" doesn't work, that spot - mouse right click doesn't work, third spot - second monitor flashes every 10min...
And then there is this constant "I don't belong here" feeling. Sure it is more "efficient" from the space and hardware utilization perspective. For call centers - I don't mind the setup, but good luck to you if you are planning to build software in such environment.
Bunk-bed desks.
cubicles were a step down from individual offices, and was the manifestation of commoditization of the software engineering. The transition from cubicles to open offices was the part of that process going even further. Basically blue collar workers of 196x on a large factory floor.
One would think that we've reached the peak of bad offices ... Well, i think some form of vertically stacked option is coming in the mid-term. In the short-term i think the next thing is the "cloud" style approach where no office desk is assigned permanently and coming into office you'd have to [find and]schedule a desk for yourself. That would allow to cut office space even more.