Eh... We get way faster to the solution when standing together in a room and discussing it then over teams, and fast questions are easier to do and show if you are sitting next to a colleague. If I have my stories and know what to do, then home office can even be more efficient (less distractions). It depends on team/organisation structure, type of work, etc. It's totally unnecessary if you get your tasks from top down or everybody has a well defined field where he's best left on his own and some trams will klick in a way where a slack chat is all they need.
But It's short sighted to look at WFH and see it as the be all end all.
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By the way, many of the worries here are cause the worker rights and unions are non existent in the us. Our 2 days home office are in the contract since the pandemic negotiations, and they could not take that without some other compensation that we are accepting.
Overwork time just cause I'm in the office? Nah. I can't clock in more then 10h simply cause the system only allowed that if I add it as overtime pay because of regulations. If my boss would start such shenanigans like "work without clocking in", that's the day I send my first application letter to another company, no way I would accept that here.