Shit changes quit crying about it. Sometimes there's not enough time, sometimes there's a good reason.
Like that perk that u got after maxing a subclass that would give u that little extra agility/str/recovery? That would also lock your choices in, so you wouldn't be able to tinker with your abilities. Kinda stupid to have in the first place
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...but it would also have granted a new, fresh copy of the same subclass, so that you can have many