The S3 standard is certainly really important. It's perhaps the most important web standard without any sort of standards organization or formal spec (seriously, Amazon, I'm begging you to open up to ISO or IEC or SNIA or somebody).

And SQL is also very important. And yet, if somebody said "I need to store data, but it's not relational, and I just need 1000 rows, what's the best SQL solution," I would still ask why exactly they needed SQL. The might have a good reason (for example, SQLite can be a weirdly good way to persist application data), but I don't know it yet. That's why I asked.