If a dev only designs a solution that fits for exactly the current situation but doesn’t allow any changes, it’s not a good dev.

I don’t think anybody is arguing this. Nobody (in my decade-plus in this industry) actively codes in a way to not allow any changes.

I always lump microservices architecture as premature optimization, one that should be used when you’re maxed out of resources or everything is too spaghetti.

I love the idea. And I even pitched it for a specific project. But I had to eat humble pie when the devops nerds threw more servers at the problem and it worked better than I expected.