All of this entirely depends on your company culture. And for every choice you make (conscious or not) there are consequences.
Perhaps the culture within the company / department / team is to allow interruptions in the name of "collaboration". Hopefully the increased value gained by "collaborating" that way is worth the cost. Some of that cost is time (productivity), some is people literally quitting. Eventually you're left with a company full of people who don't mind being interrupted and I would assume are interrupters themselves, and I'd assume this effect is exponential, causing lower and lower productivity.
As a manager, you can't have this culture and then also complain about the lack of productivity, missed estimates, etc. (Well, you can, but that in turn will increase stress levels and unhappiness and cause more people to quit.)
Your competitor who sees collaboration is possible with planning, proper async communication channels, and some specific culture choices will have a nicer environment and happily hire away your most talented and knowledgeable people.
> where tens of hours of work will be completely lost if your concentration strays to show your face to another human being and utter a few words.
After being interrupted, it takes on average over 23 minutes [1] to get back on track. The average time lost is almost 3 hours per day, or 60 hours per month [2].
[1] https://www.fastcompany.com/944128/worker-interrupted-cost-t...
[2] https://www.talkboxbooth.com/post/shocking-cost-workplace-di...