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Why are you so sure that this is a bad thing for our brains? I find it difficult to tell what is work and what isn't (I work from home). I wonder how studies like this make that distinction. As you say, being at your workplace doesn't necesarily mean you're actually working.
Working from home is unique - many people find lines getting blurred. The bigger difference is in what your downtime is like. Working from home, you can eat or listen to music or go out of the house to the doctor's office. Take a shower, lounge about, talk to the kids or wife or friends or simply goof off. In the office, you still have to be in the office and looking like you are being productive. Maybe you have to b…
Stress is there to deal with physical lions; think long term sacrifice for short term survival not superpowers. The extreme version might be combat, but hyper awareness around threats can apply for much longer periods. Sure, a few hours a week is no big deal, but that's not 4-10 hours a day for decades.