The other thing for some of us is we can supervise our dc's lessons more effectively if they're at home.
I'm overseas so the hub system doesn't operate, but even if it did, it's basically childcare & a desk to get on with any work set.
I record Zoom videos & schedule work late into the night.
This enables me to march into my 3 teenagers' bedrooms at 8am brandishing the spreadsheet of doom.
'Ds you have a zoom meeting for global politics at 9, dd1 you've been set maths online with an option zoom plenary at 10, dd2 you have to be online to present on animals of the Sahara with 3 of your mates at 9.30. Yes well I'd email them, then. I did warn you 3 days ago'
Then I gulp down a cup of tea & zoom my first class at 9.
10:15 is class changeover so I have 10 glorious minutes ensure ds spends his free period taking the dogs out, dd1 has her English handed in & dd2 has her ducks in a row re her Arabic composition. By now I don't give a shit if it's google translated.
10:25, I'm teaching p2 online.
Rinse & repeat twice.
If I had a 'sit at a desk & do the work set, or don't, we aren't in a position to monitor it' it wouldn't be the best thing for my 3 kids.
They are teenagers so unlikely to wander bare bummed into the background of my lessons, but nonetheless they need a fair bit of monitoring.
Also, an hour at the end of every day checking what didn't get done, needs catching up etc.
& then I get back on to scheduling work for next day, filming lessons, & feeding back on work done.
I'm pulling 5 hours sleep on a good night & that's on strong sleeping pills.
We don't all have access to a childcare hub, & it's not necessarily a great thing if we do.