The details matter. A lot of people sign up for a two-year active duty contract (it's an eight-year contract in all though, you're in the reserves afterwards). That only gives 70-80% of the benefit (which only runs for a max of 36 months, not a full four years). You're also restricted to in-state public schools, no private (Ivy League etc.) or out-of-home-state schools. Most of the military people I talked to at my local community college barely got two years of schooling out of it.
The link you posted says 100% of benefits which is either all tuition at an in-state school or up to $26k/year at a private of foreign school. $26k a year is a lot...
You also get 100% of the benefit if you served for 36 months. That is a far cry from what you described.
As others have noted, a lot of what you wrote is wrong. The Post 9/11 GI Bill will cover any tuition up to the maximum in-state university. You also do not have to return your Home of Record and can declare citizenship in any state post service and receive in-state tuition (you will of course need to meet the states requirement for citizenship).
Also, many universities (private and public out-of-state) have the Yellow Ribbon program that will cover gaps between what the government provides and the university's costs.
Finally, the Post 9/11 GI Bill also provides BAH based on your universities location which can be quite substantial.
I used the Post 9/11 GI Bill to get my degrees in CS and ECE. If I was single, the money from the program would have more than covered me.
Yep, same here - GI bill + yellow ribbon paid for me to go to a very expensive private university in DC. Also gave me an additional $2500 a month in BAH while I attended.
https://www.va.gov/resources/how-we-determine-your-percentag...