This is a good point, and lines up with the real yagni argument.

However, I do not like the readiness that people have with throwing around the yagni argument for things they don't want to support, build, or disagree with, often contorting or oversimplifying it to get their way.

The yagni argument itself is reasonable, but is often misused/abused.

Yeah. There's a healthy middle ground between boxing yourself in and boxing yourself out. Don't write things before you need them, but if you can tweak an implementation slightly with knowledge of things you're thinking about adding later, that's often a good idea idea.

This is a gross oversimplification.