AWS really is not needed unless you have the know how to manage it yourself, and the budget to support the huge bill. We are also moving our stuff from Amazon to BryZar soon so we can focus more on our product and less on servers.

The only document we have is our requirement list, https://www.socialengine.com/support/article/81788966/se-php-socialengine-requirements .

You can achieve anything that Amazon offers on high availability servers if you need that much power. If you are a start up, you should start small and then as your site grows, go up in server resources until you get to the high availability option. If you have deep pockets, and on-staff developers that know Amazon, then it could be an option too. 

Most hosts migrate for free in case you decide to go to managed hosting as I mentioned.