[princess3000]

You're confusing "a necessary grind" with "a necessary period where your employer exploits you for longer hours with no additional pay." You can (and almost certainly will have to) pay your dues at some point in your professional life but your mistake is thinking that you shouldn't be compensated for it.

It has very little to do with being "cut out for it" and more to do with not being exploited. And yes, there's a whole host of exploitation of various degrees even in modern workplaces and many people have had or still have to go through with it but that doesn't mean it's a good thing whatsoever (unless, of course, you're the employer).