I've also been going in 4 days a week since we signed our office lease a few months ago, I really like it. We still do full remote (since day 1, back in 2018!) but I find that the office really helps with communication, especially amongst leadership. Doesn't bother me if any of the devs are FT remote, but I definitely prefer seeing the CEO, head of business, head of product, etc. all in person.