> Do the easy thing while it works, and when it stops working, fix the problem

Another way to phrase this mindset is "fuck around and find out" in gen-Z speak. It's usually practical to an extent but I'm personally not a fan

I've mostly heard FAFO used to describe something obviously stupid.

Building on the same thing people use for code doesn't seem stupid to me, at least initially. You might have to migrate later if you're successful enough, but that's not a sign of bad engineering. It's just building for where you are, not where you expect to be in some distant future

Not at all.

When you fuck around optimizing prematurely, you find out that you're too late and nobody cares.

Oh, well, optimization is always fun, so there's that.