I could not disagree more to such a generalized statement.
My parents took me out of school at least every other year for a vacation. I was blessed enough to have the opportunity to travel to places all over the world including China, Central America, Tunisia, Rome, etc. Not to toot my own horn, but those experiences have benefitted me so much more so than if I were to have stayed in class during those weeks.
I learned things about culture and history I never would have learned by listening to a lecture or reading a book. I learned compassion for people in other countries. I learned not to take the things we have here in America for granted. I became "worldly" at age 12 - and not many can say that.
If my parents didn't take me out of school for those trips, I would have missed out on visiting those magnificent places. We couldn't afford trips like that during peak season. And becuase they DID take me out and let me experience the world, I have been to places some people only dream about going and I feel so blessed to have been able to do so.
So, needless to say, I would take my kids out of school (granted that they are good students and have proven that they could handle such) to experience the world in a heartbeat!