Someone who would start the game would not ever find the "feature" on their own because it shouldn't be a thing, it is a longtime players abused feature.
I suppose players would want to be lied to. The tiers were missleading in many cases. A pokemons rarity in a map is dependant on what other pokemons spawn in the map and how rare they are, because it's inconsistent across almost all maps and people don't realise that, they only see a number 7 that is lower than 8 and think it would spawn more frequently than the other map. Which made 95% of the maps for a pokemon never to be used as hunting ground even if they were way better in reality, the change to tiering system deceives the player less and gives them the option to go hunt at a place they may prefer or what is closer. It isn't a hard concept to understand and it's weird people still call it a bad change or whatever.