The key is that you are working from home, where you have the freedom to use the down time productively, or at least in whatever way you desire. You also have complete control over the space you work in.

Most jobs with downtime don't have that kind of freedom. You're still in the office, in the lobby, at the cash register. You have to be at your post, maintaining appearances for whoever happens to walk by. You might be able to do some light web browsing, but you have to watch out for anyone coming within view of your screen. The suits, or customers if you're any sort of customer facing, feel slighted when they see people appearing to not care about their work.

I lost a job for playing a computer game at my desk while things were slow so I could be available whenever something came up, while multiple co-workers were literally out playing basketball in the gymnasium for our customers, not even at the front desk able to work when a rush hit. A rush did hit, someone got handsy with the one other coworker there (of the six clocked in and supposed to be there), they pulled the tapes, saw what I was doing during the literal hour of nothing, and I was fired. I had previously been told that while they preferred I didn't, I could do what I was doing during downtime so I would always immediately be available to assist customers. No one else even got in trouble, not even the handsy fucking customer.

At another place, our primary duty was answering phones, but an exec made us work a ticket queue as well. Whenever we weren't audibly talking into our headsets he would make shitty comments about us not being busy, despite all our numbers showing otherwise. One magical day we managed to have literally nothing in the ticket queue and no calls coming in. I got in trouble for browsing a work related subreddit trying to find ways to improve my skills.

I've had other jobs where I was told that I could do my schoolwork during my downtime, then been told to stop because it didn't maintain an appearance of company values. To the empty fucking entry hallway of an outdoor pool. It's going to rain today, we aren't going to get many/any customers. I had great rapport with the customers and other staff too, wasn't like I was known as an idiot or a slacker. I'd get calls from the more senior workers at the inside desk when they couldn't figure out basic shit they had been trained on.

My current job is much like yours, work from home tech, and I enjoy being able to take 30 minutes and clear my mind fucking about in a videogame when I get a mental block with some code, being able to do my laundry, clean shit up around the house, read, do hobbies in between meeting calls or when muted on one.

That is so so far from the norm though. Only possible with WFH and if your employer isn't a privacy invading psycho recording what programs you have open and when, mouse movements, etc.