Work from office is better when everyone does it. Those on my team who choose to work from the office end up not seeing another teammate the whole day, and just dial into all their meetings.
Work from office is better for people who LIKE work from office if everyone does it. The people who don't want to go specifically don't want to, to avoid those folks that want access to interrupt everyone around them. Honestly, I feel like work from office would suck less if the people who wanted it so badly weren't there. The commute would still suck but at least you wouldn't have the extroverts constantly wrecking the productivity of everyone in the blast area around them.
Ok, well then this "3-days-per-week" solution will only be temporary on the way back to 5 days per week, because even this way, statistically you will only have 60% of your colleagues present and will still have to do video calls. OTOH, you just need to have somebody from another office, or a customer, or a contractor, or ..., so meetings where everyone is in the same room will still remain a vanishing minority.
Most hybrid implementations have managers decide on the 3 days everyone on the team shows up. Team 1 does monday-wednesday, team 2 picks a different 3 days and so on.
