I'm sorry, but I don't get this. First, if you choose to stay in a place that uses this practice, you aren't being 'forced', you are accepting the conditions as you find them. Find somewhere else if you don't like it that much. Second, how close to beds have to be for one to be 'almost sharing the same bed'? For some people, sharing the same dormitory might be enough to increase their level of discomfort at the loss of personal privacy, and it's all downhill after that. Third, as others have pointed out, there are arrangements with even less privacy in places like mountain huts where there is a single, communal, sleeping platform that everyone shares.⁷
To recap:
Yes, some albergues have what appear to be double bunks, but they are actually two bunks pushed together. (It looks like there is at least one private albergue that has double mattress bed on the lower bunk with a single bed on top)
Yes, you may be assigned a bunk like this right next to a stranger. If that situation makes you uncomfortable, you can ask for a different bed, or you don't have to stay in that albergue.
Are they common? No, but they aren't rare.
The post that started this conversation referred to a video with pictures from the
old Roncesvalles albergue where there were a number of such beds. This is not the case at all in the new albergue.
Next up - Coed showers?
I would suggest that it is not unreasonable, perhaps not while we are still implementing tighter public health measures, but in more normal times, for albergues to do this. If you don't like it, so be it. Find another place to stay, don't expect your personal sensibilities to be the standard for others who would otherwise be happy to accept a bed even when the beds are jammed together.