The XIV is really a monster - even more then the tempest imo.
Absolutely not.
Why do you think the Tempest has always the best K/D of all MA planes, and the Spit 14 a merely average one?
Because the Temp is the much "better" and far more dangerous MA fighter.
The 14 has just too many weaknesses compared to the Tempest: It's a pretty unstable gunplatform, it hates diving (roll rate quickly drops to nil in a dive), it has a short range and is very fragile (like all wings). At the usual fighting altitude in the MA the 14 not eve better than the 16: It's faster (but still slower than the usual speed demons), but less maneuverable, and the 16 matches the climbrate of the 14.
The Tempest can and will engage & disengage almost at will, can fly for longer distances, strike with it's superior guns and buzz away.
The 14 is the cheapest perked fighter in AH, yet the rarest one by a huge margin (putting the limited available 163 aside).
In the long run, unperking the 14 would affect MA gameplay not more than unperking the Ta152 did... or a unperked 109K has
The Tempest plays in a totally different league than the 14. They are worlds apart.