Hybrid work: what makes an office day worth the commute?

If a company wants people onsite, what makes the day genuinely useful instead of eight hours of Teams calls from a different chair?

Planning sessions and actual whiteboarding. If I am commuting to wear headphones all day, there is no argument for the commute.

Lunch with the team plus clustered 1:1s works. Random attendance days where nobody overlaps are pointless.