The problem with trying to teleport Flame Fist's fireballs is that while Shaolin Flame is active, it's very difficult to adequately distinguish fireballs and jab feints with proper use, since they both look the same on the startup. And the EX WP is a better reversal to deal with Hellfire's false blockstrings, compared to EX Takedown against Flame Fist's false blockstrings.
On the flipside, an EX WP between Scorpion's 214 can be baited with a teleport cancel, but I'd rather not do this due to how heavily Hellfire's utility is weighed by stamina availability.
Warlock's F3 is good for counterzoning Flame Fist I agree, but if I read that a Liu Kang is gonna come in to avoid it and check with a skull/rune instead, there's likely to be some trades, and Warlock's zoning simply doesn't accumulate as much damage.
Also while Warlock definitely gets far superior armor to Quan's other variations and is good for Flame Fist's options after meterless WP, there are still situations where it can be stuffed. Not to say I never use it, it's just something Warlock has to be vary of.