I started logging this when we got our hybrid mandate, because I was tired of arguing about it based on vibes. 12 months of notes. Take this as one person's data point, not a study.
Context: SRE, senior. Work is half async coordination (incidents, runbooks, infra work), half synchronous (incident response, planning, cross-team debugging).
Fully remote days (home): deep focus work is better. Runbook rewrites, infra migrations, documentation. Zero interruptions. Average focused session: 3.2 hours before a break. Also: on-call response time faster because I'm already at my desk, no commute overhead.
In-office days (3 days/week): sidebar conversations are genuinely useful. Caught two architectural issues in hallway chats that I probably would have missed. Meeting energy is different face-to-face. But: open floor plan, so 60% of the time I'm wearing noise-canceling headphones and pretending I'm at home anyway.
Surprise finding: my worst productivity days were forced in-office days that I spent entirely on Zoom. I drove 45 minutes to sit on the same video calls I could have done from home. That's not an opinion, that's just waste.
What actually helps regardless of location: team agreements on async/sync norms, documented decisions, response-time expectations. The teams I work best with have this regardless of where they sit. The teams that are chaotic are chaotic in the office too.
I'm not anti-office. I'm anti-office-as-performance. My company's RTO justification was "collaboration and culture." But we never defined what collaboration looked like or measured it. We just counted badge swipes.
Badge swipe rates are not a productivity metric. That's the part I can't get past.