Being able to run a megacorp is very different then being able to build one.

Good news for them! They don't need to build a megacorp - they already have one. And it needs running.

>Entrenched in-groups and institutions control access to the highest paid jobs. You need to become a part of those to be allowed to participate.

That's the same thing as being difficult to replace. You gain "access" by being perceived as difficult to replace. The more difficult you are to replace, the higher your access.

Sure, it’s not easy to replace anyone. It’s often not even easy to replace cleaning personnel. But nobody is irreplaceable.

Good thing I didn't say that then

I was referring to your first sentence:

> That's the same thing as being difficult to replace

I‘d appreciate if you didn‘t respond in a passive-aggressive manner.

This illustrates the difference between 'explanation' and 'justification'.