Yes, because of Arrangement both the Standard method and Point Buy have the Dump Score problem. However, I would say that most Point Buy characters with a low intelligence (or any other low score) have it because there were no points left to spend on it.
It seems that our cookies have a top half and a bottom half determined by the Class we want rather than the Character we want. The top half is 2 or 3 abilities that are useful to the Class whereas the bottom half is 2 or 3 abilities that aren't.
So, when Arranging our scores we usually don't have much left to distribute to the bottom half, and our cookie, frustratingly, takes shape right before our eyes almost every time.
If you roll dice unless you roll all 18s I don't see any difference. You also don't get the character you want when you roll, you get the character options as determined by the results. Meanwhile I've played plenty of characters using point buy where a 10 was their lowest score. I don't consider "average" to be a dump score.

