I suspect they also wanted to thread so many needles by 1) restoring the classic Sub-Zero/Scorpion rivalry, 2) allow Sub-Zero be a literal cold-blooded threat as Bi-Han was shown in the OG MK1 comic n' game and new movie, 3) keep the popularity of both Kuai Liang (who MADE Sub-Zero with his character development), and "Scorpion"...
...and thus Kuai got turned into "Scorpion".
While he SHOULD be Sub-Zero and ice-based.... if they had Kuai Liang 100% keep his classic personality and, outside the spear for gameplay purposes, give him a bunch of elemental-fire specials to differentiate him from Hanzo (who had no such moves in the first couple games outside his Toasty fatality - he was more like a classic ninja relying on magic and weaponry) it could've worked. Hell, I confess I even like the contrast to Bi-Han's ice and complement to Smoke's smoke.
But nope. They shove Hanzo's rageful character into his personality via a contrived reason of Bi-Han allowing daddy to die, have him cuck Hanzo by marrying Harumi, and have him found the Shirai Ryu in Japan despite pretty clearly being a lifelong Chinese and Lin Kuei loyalist. And it simply doesn't work because he can't be both collected and rageful, it feels awful seeing him cuck his former friend, and his heart belongs to the Lin Kuei and the old Kuai would've fought Bi-Han to become the clan's Grandmaster exactly like he fought Sektor instead of running off to form a spinoff clan like a bitch.
He feels so unnatural now. I COULD accept him using the Scorpion name, spear, and fire element if he remained his true self otherwise, a calm contrast to Bi-Han's hotheaded cyromancer... but he's an artificial cross of himself and Hanzo. And so I find myself missing the real Kuai, the real Sub-Zero.