How is it a bad change? Ever since MK3 where it spoke of how Sub & Smoke escaped automation I had wondered what would have happened if they had gotten Subs instead. This change is not bad, he's been expanded upon. He is a deeper character because of this. And Sub-Zero should have never been a tank in the first place. He looks ridiculous in his MK9 wrestler stance.
Sub-Zero has been a slower character for the last several games, at least when compared to others. His stance is a bit ridiculous I will admit, but that doesn't mean he shouldn't have been a tank. I quite like his playstyle actually, although I could do without the ground ice he currently has.
Also, you may have wondered what would have happened to subz if he got automated, but that doesn't mean it should have happened. Smoke was always, and still is a side character. He had nothing to do, but become a cyborg. That became even more apparent when people realized his chapter could have been removed all together from MK9 because it really didn't accomplish anything. The lack of direction they have for Smoke is ridiculous. Sub-Zero still had things to do involving Quan Chi, and then going back to defeat Sektor. Smoke didn't.
Sub-Zero has not been expanded upon, more like he's been limited. Sub-Zero has had the most change appearance wise over the years. The basic ninja, the maskless attire, the old man, the shredder attire. He's constantly changing. We all know the cyborgs rarely change. Besides MK9 cyrax and sektor never looked drastically different from their attire in MK3, and they probably won't look too different from their MK9 attire from here on out. The cyborgs just don't change.
Also, he basically took the storyline from Cyrax in that he was okay with being cyber and now he would forge his own destiny.
People have discussed it before. There aren't exactly many routes you can go with being a cyborg.
Sektor- evil and wanted to be a cyborg. He loves being mechanical, it's what he desired.
Cyrax - hates the decision to become a cyborg, but he deals with it and decides to forge his own destiny becoming a member of the OIA.
Smoke - Forced to become a cyborg and wants it to be reverted.
So really he was like a mix of Cyrax and Smoke in that he was forced to become a cyborg and now he just decides to deal with it and forge his own destiny. Wait, we still have cyrax though. So what the hell is Cyber Subz needed for anyway?