I think a lot of HN crowd hangs out at FAANG/FAANG adjacent or at least young/lean shops, and has no idea how insane it is out there.
I was at a shop that provisions AWS resources via written email requests & clickops, treated fairly similar to a datacenter procurement. Teams don't have access to the AWS console, cannot spin up/down, stop, delete, etc resources.
A year later I found out that all the stuff they provisioned wasn't set up as reserved instances. We weren't even asked. So we paid hourly rates for stuff running 24/7/365.
This was apparently the norm in the org. You have to know reserved instances exist, and ask for them.. you may eventually be granted the discount later. I only realized what they had done when they quoted me rates and I was cross checking ec2instances.info
I can guarantee you less than 20% of my org (its not a tech shop) is aware this difference exists, let alone that ec2instances.info exists for cross reference.
No big deal, just paying 2x for no reason on already overpriced resources!