He cares about the under 30s not spending a fiver a day in Pret or 15 quid a day on travel to get to work
£15? Try doubling that (and some).
As someone said I don't think the issue is the office so much (although office politics is a huge problem, and some offices are horrible to work in) but the commute which comes from the concentration of employers in one place - notably London but other population centres too.
I've said this before in relation to house building - but we need far better investment in job creation outside those large population centres. I wouldn't mind going to an office if I had eg had a 20 minute drive or 10 minute to get there, but when you are spending 3 hours a day commuting and spending £4000 a year, you waste so much time and money that full time or near around WFH becomes very attractive. Plus the fact that commuting is bad for the environment.
There's no one size fits all solution and it's weird that people would think that there is. But employers providing flexibility and allowing people to play to their strengths, while rewarding output not bottoms on seats, would go a long way to improve employee morale and productivity.
One other important issue is to avoid a two tier system where some people work flexibly and others can't. It's more difficult to have flexible working in eg a shop where you have to be open certain hours and have people on-site, but it can be done to some extent . As an example, I saw a local shop advertising in our local FB group very recently for two new members of staff with hours set out. And I immediately wondered why they didn't recruit the two members of staff and then let them sort out the hours they wanted to work within the requirements of the business - so eg instead of saying person A must work Mon, Thurs and Fri and person B must work Tues, Thurs and Sat, why not say they both have to be in on Thurs and the other days need to be covered as they prefer. Eg one person might prefer to do Mon and Sat. Or you could rotate the Saturday so they both get every other Saturday off.
Sorry this turned into an essay!