Couldn't agree more. What people
complain about is not necessarily an indication of what's
not working.
My last two gigs have been open-plan, and I prefer it much more than closed-cube spaces. If your team is working as it should, and is in close proximity to project/product management, with a good process and a healthy level of trust between the stakeholders and between the various engineers, then in my experience open-plan is far better, because the quality of communication is high, the general focus of the team is high, and there's less background noise "distraction", because the cross-talk is usually relevant and on-task, and has a higher likelihood of being pertinent to the job at hand. Open plan offices work well when the team is already working well.
However, if there's broken processes, unfocussed coworkers, and a general level of distrust between team members or across teams, then the background chatter becomes exponentially more distracting and frustrating. Unfortunately most teams tend towards the latter and not the former.
In other words -- in my limited, anecdotal experience (last 5 years, two large open-plan teams; 10 years before that in closed or hybrid), high-functioning teams tend to thrive on the cross-talk and constant communication that open plan creates organically. Lower-functioning teams on the other hand have done better when the natural barriers of walls and closed doors limit unnecessary distractions and create healthier boundaries.
So it's not surprising to me that the study shows more instances of teams unhappy with open plans; it's certainly not for everybody. But the best teams I've been on have absolutely thrived in that environment.