most guides are not set in stone. Builds are just outlines it's all situational in game in some games go for the gp10, but I do agree sight stone is better to rush, but down voting because of it not cool
Sightstone is completely overrated. You are going to spend 700g (which you probably won't have on your first recall) on 100 hp and you can't ward the lane brush and the tribrush and the dragon at the same time. That would still require additional wards. Also going Sightstone -> GP10 will delay your other items ( Mikael's Blessing/ Aegis of the Legion/ Twin Shadows) compared to the other way around. In addition to all this; lots of supports require additional mana regen in order to lane properly.
TL;DR: If you just downvote guides just because they prefer to get gp10 before the precious Sightstone; you are an idiot.
Pretty legit if you ask me.
The majority of a support's money gets spent on wards anyway.
TL;DR: If you just downvote guides just because they prefer to get gp10 before the precious