Is it up to the giver of advice or the taker? In a way, the giver just wants to talk about their experience. The taker wants to use the advice. It seems more realistic to have the taker vet what's told to them online.
The issue I have specifically is that advice givers tend to give advice either in an unprompted way or as if it will apply universally. For the post at the top of this thread, while it wasn't unprompted, it's positioned as if following the rules _will_ lead to you having better focus, when the realty of the situation is that they won't work for everyone. Something as simple as prefacing these rules as "this is what worked for me, maybe it'll work for you too" is enough to counteract this.