I love Pathfinder, and i wish that paizo expand the rules, i dont want more feats, i rather an escalating leveling to 30th lvl, balance on the rules, Prestige Classes more like mythic tiers instead of xp dependants, and paragon racial options.
its too easy to do such a thing, i did with my house rules and was only I working on it. why paizians can´t offer something alike?
It's not something specific to their game world. They could do it, but their own characters can't make use of the rules. Much like you can make any race you want to, or half-race, but you'll never ever see them exist in Golarion because those were the rules they set for themselves. It's why there's sometimes disclaimers/sidebars on their books that give you "suggested options" for outside their main books.