There is no question to buy and use the best you can afford. However your other premise is wrong.
"Beginners who may have had their camera less than a month shouldn't be shooting weddings either."
Many people call upon "photographer" relatives and friends to do them a favor. They may even pay them a substantial amount of money to do it. It is not your place nor mine to proclaim them as unqualified and have no business doing it. Relatively lousy photos in my eyes may be treasured keep sakes in theirs because Uncle Bill took them. It happens all the time. Goofy bedspreads are treated like gold because some old lady in the family made it. She must have been given to strong drink seeing how warped and crooked it is. But it is not my place to put a value on it.
There is nothing wrong with warning newbies about the pit falls but a good scolding for being unqualified is not why they come to a beginners forum.
Okay just for the record, what you just did there was take my very general broad statement, turned it in to a very specific example, and refuted
that. That's what we call a "straw man argument."
Just to play along though, you're telling me that if someone posted on this forum, perhaps in this very thread, and said, "I got my very first camera for Christmas, so I'm going to put an ad in the Yellow Pages as a wedding photographer," that you wouldn't jump all over them for being unqualified?