People stacking jobs have next to no interest in anything about the jobs except getting paid, and are really easy to spot in high performance environments becau

People stacking jobs have next to no interest in anything about the jobs except getting paid, and are really easy to spot in high performance environments because they tend to make a lot of excuses and miss a lot of deadlines. What you are saying is this: how an employee spends their time is 100% the responsibility of their manager. That's extremely infantilizing - strong teams I have worked on expect employees to self-manage their time productively and deliver about "full time" bandwidth (minus time off, maintenance work, etc) on a consistent basis so we can effectively plan and execute. I'm speaking from experience: I had to deal with a new hire whom I was assigned to mentor who tried to juggle just one other job and it was super obvious they weren't working when they said they were. It took a long time to work through the PIP process, and effectively that person stole not only the company's time and money, but wasted a good deal my own time and patience. Fuck them and their entitled mentality. If they had gotten their shit done on time and without sketchy meeting aversion, they might have continued enjoying the second paycheck. Frankly if they had done good work and in a timely fashion it might not have mattered if they had another job - but if you're employed (not contracted) ethically speaking that employer and those coworkers are correct to expect that job to be your first priority during the work week.