You can begin unlocking Legendary-type Hero weapons at levels earlier than 150+, if you start pumping the required colour Masteries from an early enough level.
But the way it’s set up now on console, you have to track your base (personal) mana masteries with OCD obsession in order to know where to put your level up points. I usually take a photo of my Hero-specific mastery Overview before I start my gaming session on console.
What’s displayed on the mana masteries Level Up screen is a huge point of divergence between the console and PC versions. When I mentioned this to 505games support personnel, who agreed that this was a valid point and that the way that Infinity originally designed it makes better sense, he suggested we should rally in the forums and ask the Console Devs that this particular difference get fixed.
So, there it is. If you want the masteries Level Up screens to get corrected and NOT display only Global masteries, you’re all going to have to ask for it officially. That’s all I can say.