Sad to say, this practice of handing more work to your most efficient worker is common practice, especially if you are on a fixed wage. Corporate will always try to spin it as "We need to know you can handle the workload so we can promote you....blah blah blah"
That's also the reason why so many employees are pushing to WFH so at least when my task on hand is completed, I can go do other non-work tasks and when the workday is over, I can actually relax and do stuff I want to do. Pretty sure Corporate recognise this too and is one of the reasons why they are pushing so hard for people back into the office.
Was just talking to a friend yesterday about this and he works from home, but feels that it is no longer a home at all. With summer holidays coming, he would normally spend a lot of it at home doing tasks around the house, but now it feels like an office, so he doesn't want to be there at all.
That's where boundaries are very important, especially if you WFH. For some people, they need a dedicated workspace that trains their mind that this is where I work and the only place I will work at home.
When I WFH, I work at the dining table, but I always make sure to clear up once work is done. Firstly, I need the space for dinner and secondly, out of sight, out of mind. If the laptop is not there for me to turn on or use, I wouldn't. Humans are resilient and adaptable, remind your friend that.