I completely agree. Proper citation is absolutely critical to high quality scientific posts. You need to be sure (or at least be able to check) that what you are reading is actually correct, or at least regarded as correct by the scientific community.

Especially in the internet mere speculation or sometimes even flat out wrong statements are often sold as concrete truths. So citations are essential if you want to be taken seriously.

Also disclaimer: Yes, it is sometimes hard to find proper sources and yes, I too am guilty of taking the easy road to Wikipedia sometimes but I only use Wikipedia for elementary stuff and try to find better sources where I can.