Of course, they're different in some ways, and of course, not identical. But the similarities are totally relevant.
In many ways a QB fumble is worse than an INT. At least with an INT, the defense often ends up with the ball further down the field, while a QB fumble, if recovered, is closer to scoring for the opponent, and more likely to be a score, since there's less offensive players in proximity to tackle the defender. Any defender that picks up a fumble in the offensive backfield or close to it, is probably 10 times more likely to score than a DB who INT's it further back. And of course if they don't score on the turnover play, they're still more likely to score on that ensuing possession, due to better field position.
And yes, I realize the opponents did not recover a lot of his fumbles, but do you really want a QB playing russian roulette every time he fumbles ?
Well, that's fine if the pass protection is bad on a short-term basis. But if you're a QB and you KNOW your pass pro' is perpetually poor, what do you do as a result, and as a professional ? You make adjustments. There's a whole list of things you do, and can do, to protect that ball.
No different than a RB, who has a fumbling problem. What do you expect him to do ? Continue to carry the ball recklessly, or make adjustments to protect the ball ?
It makes no difference whose fault the pass protection is, as it's still the QB's responsibility to take necessary precautions to protect it.
Bad pass pro' does not give a QB complete immunity,