I like the OP's initial eight roles much better. He narrows them down to three, and makes some good points.
Again, what? Look at the strong guy in virtually every single super hero group. They are the defenders. Thing, Colossus, Superman (and I mean the Justice League Superman, which is a bit different from other interpretations), Hulk. How are those not defenders? They are there to put a stop on the big bad guys and let everyone else do their thing.
Wait, what now? I'm playing a 5e crusader fighter. How in the world can I be a controller? I get no AoE attacks, none. I'm a sword and board fighter, so the ranger/rogue, with his bonuses to attack with a bow and sneak attack damage dice will almost always out damage me. Now, tank? Sure, I can do that. And since 5e doesn't really allow anyone to grant out of turn actions, Leader is largely out, but Striker or Controller? Nope, sorry, not happening.
"Strong guy" is defined by supernatural strength and sometimes durability. "Defender" is defined here as "a character with the defender role primarily focuses enemy fire by making it difficult for enemies to move past, and punishing enemies who attack other party members." The two concepts could conceptually overlap, but although my knowledge of superhero comics is limited, it seems clear that the Hulk for one is not a Defender at all. He never (AFAIK) intercepts attackers headed for other characters; he just goes and smashes things. (Not always in combat--part of the "strong guy" role includes things like lifting fallen telephone poles off cars and smashing holes in walls. It's not purely a combat role.) If anything he sounds more like a Striker, since "Strikers specialize in dealing high amounts of damage to a single target at a time," except that also misses 80% of the Hulk concept, which is everything related to the manner in which he does that damage: by smashing people's faces in with raw strength.
The concepts "strong guy" and "striker" overlap a bit in the combat domain but they are quite distinct nonetheless. You must see this.
I like the OP's initial eight roles much better. He narrows them down to three, and makes some good points.
Again, what? Look at the strong guy in virtually every single super hero group. They are the defenders. Thing, Colossus, Superman (and I mean the Justice League Superman, which is a bit different from other interpretations), Hulk. How are those not defenders? They are there to put a stop on the big bad guys and let everyone else do their thing.
All of which invalidates these roles.
Well, it sure invalidates the "strong guy = defender" equivalency. I don't know what you mean by "invalidates these roles." Maybe you mean "invalidates the application of these roles to the superhero domain."
It applies to defender and striker.