If you disagree with a question you can always flag it for closing. The flags will be reviewed by the moderators and the community users. If enough people agree a question should be closed the system will take care of it; no humans need intervene.
That being said, over time, we've gotten pretty good as a community at recognizing the common questions that occur post-Apple announcement of new products and heading off those questions from very low-rep users with existing self-answered questions.
This is an accepted practice here on Ask Different.
You've provided to examples but they're both slightly different.
In the case of What are the differences between the iPhone SE, 6s, and 6s plus? -- the user asked a pretty straight-forward question and self-answered. Nothing wrong with that and it's something that's done post-Apple announcement with some frequency here. There's good prior art for this sort of thing on the site.
And a slight diversion here: answering your own questions is not only okay, it's encouraged by the Stack Exchange system. You have an "answer your own question" box right below the "ask your question" box when you're creating a new question. Stack Exchange exists to capture questions and answers with as few rules as possible. Sometimes people know the question and the answer and why wouldn't we want them to share this knowledge with the world?
However, for the second question you linked to, What are the differences between the 9.7“ and 12.9” iPad Pros? -- the asker did not provide an answer. It needs an answer. And it's a legit question. We will see people asking what the differences are between the two models.
The simplicity of a question or the ease with which an answer can be obtained aren't good measures for whether a question should be asked here or not. We certainly don't mind simple or easy-to-answer questions!
I will say that your answer on the "What are the differences between the 9.7“ and 12.9” iPad Pros?" is not a good answer. We strongly discourage "read the text behind a link" answers here. Links rot, which means the text behind them gets lots. Pull the relevant details in to your answer in addition to providing the link would make it a stronger answer. As written, it will attract down votes.