> Being at a startup is hard in a way that is almost indescribable to anyone who hasn’t experienced it.
Being at a startup as an employee isn't necessarily hard. You hear this type of "startup is so hard" because running companies well is hard and successful startups will often grow faster than their founders are able to grow their own ability to run companies, which makes their own job challenging. And a lot of startups are poorly run in ways that are entirely avoidable (often as a result of their CEOs not being able to grow as quickly as their company) which can make life hard for the employees as well. But this isn't a necessary part of the startup experience.