Well that sounds good in theory, but the truth is that more people say they are unable to go back to work due to long term sickness than ever before.
I suspect this is largely among a cohort of low paid, low skilled workers whose jobs cannot be done from home, finding they are only marginally less well off (but much happier) claiming long term sickness or disability benefits compared to slogging it out in a low reward job several days a week.
If their jobs were cushier, better paid, or of the WFH variety, they may be rather more willing to keep doing them, but some people are never going to have those sorts of jobs because they don't have the ability or the qualifications.
It's interesting that you say you save a lot of money on fuel. People who now manage to WFH in a job where that was never an explicit part of the contract are raking it in financially. They realised this during Covid and it's no wonder they are reluctant to stop. They've moved further out of big cities to cheaper areas, they've cut down on paid childcare, they don't have commuting costs, maybe they can now run one family car instead of two. It stands to reason they are reluctant to give that up.
But unless your contract was negotiated on the basis of a typical week being WFH with the occasional in-person meeting to attend, then you are wanting to have your cake and eat it. I am not against WFH per se, but I do think people have become rather entitled and resistant to putting themselves out, and expect the world of business to bend to them while still taking the same salary. If companies genuinely didn't feel any negative effects from that then they'd not be making a fuss about getting you all back in, would they? They'd be ending their tenancies on their office buildings and saving a ton of money and going completely WFH for everyone, with business suites/conference rooms hired for the occasional in person meeting as necessary.
I think companies should re-negotiate people's contracts. Give them the choice of either coming into the office for however many days a week they deem necessary, or saying you can WFH except for 2 days a month or whatever, but you need to take a 20% pay cut. (or whatever amount they deem reasonable in the circumstances.)
People saying they will just leave if their companies push are forgetting that even if their company capitulates to keep you in the short term, you may well be looked over for promotion or a decent pay rise if you are seen as uncooperative and inflexible in ways that you never would have felt entitled to be pre-COVID.
Perhaps they will save quite a bit of money by calling your bluff and allowing you to leave, then re-hiring for much less on a contract where a clear WFH is specified from the beginning.