Kinder reader Inflection wanted
So looing at the fighter/ranger/paladin material style options, warlock invocation, and artificer infusions ... I can't help but think that subclasses might not be a thing in 6E. That sub-classes would fall away for adding level based options with prerequisites which adds more class flexibility than subclasses. You could also roll feats into a general feature list which could substitute class features. Then if an idea is found that can't be built they release more class feature options under a theme like they do subclasses now, but if your have a feature you don't like in a bundle, you just replace it with one you do want which will add to your character uniqueness.