I'm a software developer and have wfh since having my first DD 19 years ago.
When the children were smaller and I could not work and look after them at the same time, I fitted my hours in when they were asleep / at nursery / DH being at home / some help from parents. I went into work half a day a week. I was not on front line support, ie was not answering the phone to customers, so could be flexible about exactly when I worked.
I was grateful to the company for allowing me to do that, but I did take a big wages hit as they basically decided I didn't need pay rises and I couldn't leave.
In recent years, even before covid19, wfh has become much more common in my profession. For the last 4 years I have worked for a company where everyone wfh. Pre covid we went into the office 1 day a week. Now we have daily meetings via Zoom.
Now that the children are older I work more normal office hours, but I am there in case of emergency and it is easier to fit in appointments, school plays etc.
I am glad wfh is more common as it is a game changer, especially for primary carers, as you gain the commute time back and it can depending on circumstances save on childcare. From the employer's point of view, it saves on office costs and it is easier for employees to work late when needed.
Some people say they are less productive wfh but I find the opposite, I suppose it depends on the job. You do need to be disciplined but I regard it as a privilege and don't take the piss.