I wondered what WikiPedia was built on.

Then I realized that a better question is, should I be building a system without checking if one exists? No. Do I understand WikiPedia well enough to choose if it can be used for my system? No.

Wikipedia – Wikipedia Cite note, the idiom for that is “If it ain’t broke, don’t fix it.”

Meaning, if it isn’t broken, don’t change it because you could make things worse. If you think it is broken – communicate that.