No, you should write some reasoning why you think the post is AI, not just state that it is. I know it's tedious, but what's obvious to you, isn't always obvious to the one handling your flag.

That's fair. Just for me personally, if I had to explain every time, I would simply stop bothering to flag them. I don't imagine I'm the only one.

The admins are welcome to decide whether they'd prefer quantity or quality when it comes to flagging AI questions.

Once again, this question is not about any AI content. It is specifically about that subset where it is blindingly obvious that it's AI. I'd post an example, but I was advised by mods that it's discouraged to call out individual users/posts, so I suppose you'll just have to trust me on that one.

How often do you really see such blatantly obvious AI for this to actually be a problem?

Honestly not that much. I think one was a couple months ago. Second was this week. Not such a big number at this point, I'm speculating that when the site gets bigger it will remain at the same proportion of the userbase.