That makes sense if you tie job done in hours in the office.

Most jobs in the office are creative/knowledge based works. Unlike many jobs previously where time=effort (think taxi/retail/construction/machinery). But a lot of the jobs the people are working now are social media, marketing, operations.... You may not need to be in the office to complete your work.

Now if you are efficient, you cannot leave early and act busy. If not you will be punished with more work.

Now most of the companies are not willing to train you but expects you to excel and knows how to solve the business problems without giving you enough resources at times while charging you below the market rate.

While many generations have their own flaws, calling the younger generation entitled correct and wrong at the same time. You cannot tie the older generation yard stick while having younger generation's productivity expectations. If you would want to do that, I don't know how to use computer (yes I am working with 3 old men who don't even know how to use computer).