"That's a very nice car you've made. Unfortunately, if the designer later decides that it needs to survive artillery rounds, you'll wish you had built it out of armor steel as I recommended in the first place."
... I guess this season some of us have more time to overthink things.
Still, YAGNI needs careful consideration. What looks like YAGNI right now might be reasonable flexibility that will be needed as the project matures. YAGNI makes perfect sense when delivering a proof of concept, but it's not that straightforward when designing for long-term use.
The parent comment is a bit exaggerated but it still has a point. One needs to be able to predict things and make sure whatever you do today isn't so rigid that it can't adapt to other things in the future without a major overhaul. Typically this means being cognizant of the assumptions made along the way, and making the minimal set of them. This kind of insight requires experience. People preaching YAGNI just don't seem to have much of it. They just read "YAGNI" in a blog post and then yell it at other people.
When it comes time to make a change, it's often not as big a deal as it was made out to be, and you have the benefit of everything that has been learned along the way. No one gets it right the first time anyway, so don't overthink it.