If you base your position on something like that it is already wrong. I mean, with same success I can say that you are blind if you think that Torb is fine as he is. See how much sense it makes.
Sym had design problems, not balance problems. Devs solved design problems by reworking it and now her design is fine. But they failed at balancing this new design. Old Sym could no be fixed by number tweaks. New Sym can be fixed by number tweaks.
Because before making any statements about heroes and their viability you should learn the difference between balance and design. Some non-viable heroes had good design, but their problems were in balance and numbers. These heroes were made better but simple number tweaks. But some heroes has problems not in numbers and balance, but in design. They have core flaws in their design. These problems cannot be solved by tweaking some numbers here and there.
Torb is that kind of hero, his problems come from his whole design. Numerically he is a good and balanced, he has okay damage numbers and other characteristics. But he is still trash-tier hero with almost zero viability. And now matter how you buff him in his current design - he still will be a trash hero. You can give him X2 damage, or double his projectile speed, you can completely remove his critbox - he still will be non-viable troll pick.
I understand why people are afraid of reworks after Sym rework. But they need to understand that the main goal of major reworks is to solve design problems. Balance problems, if they are there, could be fixed later if design problems are solved.
Well, judging how the devs said it, the turret will upgrade itself slowly,
meaning, he might be even less viable on attack, because i will have to wait 5 - 10s (my prediction) in attack with a puny 150hp turret and somehow keep it alive for that long
.