It was implied that you care about world-building too much, when you've mentioned that your biggest problem with Mare-Do-Well is the lack of world-building. Even though for me, I don't actually find it as big of an issue with the episode as you had. Though I'll admit that despite how I still like the episode, I do find it to be kind of dumb at points.
No, I did not say the lack of Worldbuilding was my biggest problem with Mare-Do-Well. I outright said near the end that Mare-Do-Well’s biggest problems had nothing to do with Worldbuilding. The characterization of the Mane 6 was just too far off. Rainbow was TOO egotistic, the rest were too spiteful and come across a bit hypocritical when they’re basically hinting that they’re behind Mare-Do-Well. Characterization is the most important thing about the show. And Mare-Do-Well is one of the few episodes of the show where it gets pretty much no one right.