To be fair, for a start, no one is responsible for someone else’s statements. Beyond that, the post you’re replying isn’t even saying you can’t optionally add things to a base class. Just that it must be optional.
The truly mad part of this discussion is that every martial class has the ability to add supernatural/magical elements.
The argument goes…
A: There’s a martial v caster disparity!
B: I’m not sure there is
A: There is because casters can do things that martials can’t.
B: Yes but I’m the grand scheme of things that isn’t improyant
A: It is, and the world hates martials, they’re useless
B: Well they’re very popular, the most popular (shows stats)
A: They’re just new players who don’t know the rules well enough.
B: Well here’s a survey on EnWorld full of Grognards that says otherwise
A: Popular doesn’t mean good and It doesn’t change the fact that there is still a disparity.
B: Ok well make a 3pp to create a mythic fighter if you think it will be popular.
A: No it has to be by WoC. They need to fix the martial v caster disparity
B: Well they’ve done a lot to address that since earlier editions.
A: Not enough. I want more.
B: Wait a minute, doesn’t every martial class have the ability to gain magic abilities through subclasses, races and feats. Can’t everyone know do some amazing things irrespective of what class they are provided they invest a little bit. Invisibility, flying, throwing fire bolts, magic shields, can all be taken by martial classes now right?
A: …
A: …
A: …
A: … Well obviously I don’t want them to cast spells!
B: [Bangs head on desk repeatedly]