Do projects these days really need like main office?
Not really IMO. The IT sector is scattered all around the world and it works fine for some time now. No need to have everybody in the same room.
Even the big companies around the world are sending their employs to work at home multiple times a week as it has been shown it reduces costs and boosts productivity. That has to become the future of workplaces. No need to cram people in the same place with all the technology available.
that is definitely a lot more eco-friendly as well. In the IT industry a lot of energy is wasted unnecessarily so this is a good approach. For blockchain-based project it can reduce the harm mining makes.
The productivity boost only happens for people who are very self-motivated and determined. If you need guidance it's not so good to work from home.
Nah, systems and monitoring is so advanced today, that people who work from home have more communication and control from their managers, team leaders etc. then those who work in physical office.