don't vent because of poor play teach them a proper rotation.

[Zojha]

Why should I?

So you can save yourself the effort of writing more than one short question.

If they don't want your advice, they are going to ignore it either way and you're just wasting your time typing anything more. The only time you achieve anything is if they are receptive to advice. The question thus allows you to check whether you'll be wasting your time trying to give them advice or not.
That might not be relevant to you because you don't care whether you are wasting your time or not, but it's more efficient to ask in advance. The fact that it looks more considerate to the other person is a bonus.