I’ve never heard of a work place where the employee is responsible for finding cover when they are off.
It's apparently pretty common practice in low-paid service industries like restaurants and retail. I've even heard of teachers phoning in sick and being asked to provide a full lesson plan for their cover teacher, CCing in various members of admin staff. You'd wonder how these workplaces would cope if someone was hit by a car and was rushed to hospital.
The question to be asked is (as a 61 year old) why is it that the piss takers are all under 30 while the older staff members turn in day in day out?
You tell me. There have been calls of 'no-one wants to work any more' and 'entitled' younger workers that 'lack the necessary skills' since time immemorial. But if I had to guess, I suspect there's a huge difference in motivation between the people who entered the workforce at a time where you were rewarded with a salary and benefits that enabled you to build a comfortable life for yourself, buy a house, save for retirement, pay off your modest student debts, etc, and the people who entered the workforce at a time where the pay barely allows you to afford a shitty rental in the city you work in. Whenever I find myself annoyed at shitty service here in Vietnam, I remind myself that I'd probably be doing a half-arsed job too if I was being paid a pound an hour.
Ultimately there's a huge amount of anti-work sentiment in America right now, so it's not surprising that fewer and fewer people give a shit. The pandemic in particular, but also loads of highly-publicized mass layoffs, taught a lot of people that it's futile to work yourself into the ground for an employer that will drop you at the first sign of trouble. With that background, it's not a massive surprise to see lots of younger workers having the attitude of getting whatever they can out of their employer and then fucking them off at the first sign of a better opportunity.
Personally, I've definitely found myself taking my cue from my employer. I'm a teacher, so I'm fairly free to work when I want other than the actual classes. As a result, I tend to do a fair bit more than my contracted hours. But if my employer starts to get petty about things (as one did after covid), then I will respond likewise and start 'working to the contract.' If my employer started to do things like asking us to fill in a timesheet, I guarantee they would get far less hours out of me than they do currently, and there would be far more, "Sorry, I can't do that. I've already hit my allotted hours this week."
I get that in certain industries, these things are necessary, but you often hear about them in places where it's not. And that's when you end up with stuff like presenteeism, where people boast about how many hours they do or always being in work come rain or shine, without actually getting any more work done than anyone else. Note how none of your criticisms of the younger staff members, for example, are actually about the quality of their work.