COVID gave people or in many cases made people re-evaluate what's important to them and many people concluded that their work-life balance placed too much importance on work. People had been thinking, what parts of their life were they willing to give up for work, but now the question of what parts of work are they willing to give up for their life is considered a valid, and possible decision.
This decision wasn't made in the abstract; WFH gave people real experience in what they would gain and lose by not going into the office, and what they would gain and lose by not commuting, and in many many cases, the tradeoff was worth it.