Working from home means my employer gets more productivity, since I can handle "life" things easier without having to run home. They save money on office space, in-office meals, chairs, desks, and such, and I get more autonomy on my personal setup and how I want to work. It also means that people can move due to life reasons such as to be closer to an elderly family member, and still stay working for the same employer.
I could get steps from walking around town, or, I can walk my dog while I'm waiting on a build or at lunchtime. My kid is home a couple days this week because of break for the upcoming holiday, so she gets to go with me and the dog on our morning walk, and I don't need to worry about child care.
I like the people I work with, and have built rapport with them over years of working together on difficult problems. We connect based on our professional mutual work, but we each have our own interests and families.
Remote work emphasizes this professional connection and broadens your ability to work with more varying people due to the limited and directed nature of the communications and interactions. You don't need to worry about the person in the next cubicle loudly talking on the phone or eating potato chips or burning popcorn in the microwave. It makes it easier to focus on positive interactions and tune out the bad ones. If I don't want to hear all the sports talk, I'm not in the #sports slack channel.
Yes, I could operate in an office environment, a lot will probably return to it. However, I've been fully remote for years, and it'd be a hard sell for me to go back.