Because those sites are all too lazy to write their own thing. They copy paste from forums so they have to do minimal effort and earn money from the clickbait

A note for PC players: many of the Guiding Lands armor sets are only available after a few updates, such as the upcoming Rajang update.

Seriously? Only female armor? Male and female ones look completely different

Missing Kirin, Vaal hazzak, nirgegante etc....

To start crafting these you need to farm in Guiding Lands, and it is only reachable after Iceborne story completion.

Why doesn't a SINGLE guide anywhere just tell you the requirement to be able to start crafting basic layered armour pieces from guiding lands materials?