Great solution but until then I think the gp's point still stands.

We as humans need to ensure our actions are done with care are forethought. You can't control others but you can control yourself and influence others (like this comment attempts to do)

Plus, it's a lot cheaper for all of us if we don't need to constantly redesign once someone figures out how to "beat the game" (see Goodhart's Law). We're social creatures and the Tragedy of the Commons is a much more common occurrence than people think, especially in large cities.

Our actions affect others.

Yes, I've seen some of this. While it certainly helps, it seems like a waste of limited resources. Why can't some people just follow such a simple rule?

Waste of what resources?

If anything I'd expect the sidewalk to be cheaper.

There's a difference between starting from scratch and modifying existing infrastructure

There is.

But the post saying it's a better method isn't suggesting extra labor to do modifications. That's useful just as pure knowledge, and also it can be applied into future designs or when parts of the road wear out.

In Seattle, I've mostly seen approaches such as this as a modification. Though I see your point in a new construction situation.

the picture on that article looks like a nice stripy parking space

A car could push into the first third of it, but visibility would be fine in that case. Trying to use the whole thing in a car would mean you're jutting into the traffic lane, and anyone willing to do that is causing bigger problems. And if a bike parks in the stripes that's fine for visibility too.