re: What’s the end game for all the students in Hogwarts?

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They are not being prepared for life with normal people. They live in a world almost completely separate from normal people and only tangentially touching it. They can use all the magic they want in their own world.

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It is no different than going to boarding school.

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I think these two statements, together, make the most sense.

If you go away to an elite boarding school, odds are you wouldn't fit in with middle-class (normal) people, in real life. However, it opens up a "magical" elite and exclusive upper-class world to you, that the guy who goes to Hometown High has no access to, and likely doesn't know exists.
These kids from Hogwarts have huge advantages over Muggles when it comes to business and politics, even without directly charming their partners, they have much more access to info and are more efficient. They're able to "get things done". That, and they're networked just like any elite school is. I'm sure they live well.