Probably because the userbase of 3rd party file explorers is so marginal it's not worth alienating less tech-savvy users. The common theme from OldNewThing blo

Probably because the userbase of 3rd party file explorers is so marginal it's not worth alienating less tech-savvy users. The common theme from OldNewThing blog is that they usually don't cater so much to power-user audience, since power-users mostly aren't happy with what MS offers them and go for 3rd party tools anyway.