Why am I not surprised that you missed the point again?
My point is not that solo-tanking is not balanced currently. It's that it will never be balanced in the future regardless of the changes you make and will make balance worse. I base that on SE's track record with balance and our tendencies as a player-base.
SE can't even properly balance our existing comps and jobs. Fact.
As players, whether it be PLD vs. DRK vs. WAR, BRD vs. MCH, WHM vs. AST vs. SCH, MNK vs. DRG vs. NIN, we have always ostracized the less effective jobs and comps. Fact.
SE didn't force us down one path. They might've wrote the script but we acted the part.
So what actual support do you have that your vision can work? None. Meanwhile, plenty of precedents show that it will be a disaster. That's why your argument has no intellectual honesty.
And, my other point was that based on how this game is designed and how SE handles raid content, solo-tanking will limit SE's flexibility and creativity with mechanics and raid design. How do you design mechanics like jails, time-gates, gavel, etc. which have specific role requirements when you no longer have the role composition the mechanic depends on? You change the mechanic so that it's less specific and more generic. How do you manage add-splits and tank swaps which are forced by ginormous damage-up buffs or vulnerability shifts? You just have to dumb down or remove those penalties completely.
And, my final point was that even if SE goes in your direction, all of the issues I listed require time, dedication, and man-power to deal with. That's time, dedication, and man-power they're spending on one niche style of play in one role rather than the rest of the game. That makes no sense from a practical PoV. I'd rather they take the time they'd waste on your pipe-dream and actually design, tune, and balance the existing jobs better.
Those are my three points. Before you bother responding, make sure you actually know what they are for a change.