Enterprise operates differently. They don't care about what postgres or EC2 or whatever can do, it's all about not doing anything that someone can point a finger at you for later. Nobody ever got fired for choosing IBM, Oracle or Microsoft. Also, companies that supply software to corps also supply something that's probably more valuable than the software itself. Support & Maintenance agreements. The fact that if anything goes wrong they can call up a phone number and immediately have a consultant($200+/hr) show up at the corp's location and troubleshoot the problem is a lot of accountability they don't have to directly absorb. There's also PCI compliance and just general fear of new things.
Accountability/blame is the name of the game. You want that value for yourself to be zero unless you get privileged info that the project has succeeded before everyone else finds out, in which case you then scramble to get your name on any documents or email chains related to said project so you can claim it was all due to your planning & decision-making.
I've seen this happen several times and was personally burned hard by people I thought were my friends back in 2006. I'm still bitter about it. I will not let that happen to me again. And I know it happened because I didn't properly document what I was doing and why. Or maybe, I just shouldn't have done it at all and just sit back and watch everyone else panic and burn.... whatever. It was my first job out of college, I was naive.