Curious why?
I disagree entirely. The 14 is a monster if its not flown like a typical noob-driven 16.
You can say the same about many other non perked planes, like the 109K-4 for example.
The -14 is the most under-used perk ride. Both pure kill number as well as K/D fall
far behind all other perk rides, in terms of K/D its always even far behind many non perk ones - and it's perk status already keeping newbs out of it.
And there's a reason. In MA combat, there's not much to gain taking a 14 over a 16. There's a good increase in speed, but at a cost a major drop in turning performance. Still, it'S not quite as fast as most speed demons at usual MA combat altitudes. It rolls worse than the 16 too.
But the major drawback is it's handling. Stability issues make and an unhealthy tendency to suddenly go into flatspins and fall out of the sky make it not a EZ mode low alt dogfighter. The 16 will always be the "better" low-alt fighter.
When the Ta 152 was still perked, it had always a similar number of kills and K/D. Unperking it didn't result in Ta's flooding the MA too.

Spuit 14 can be a dangerous bird if flown with care... but that alone doesn't justify the perk tag. And it's my opinion that the perk status should belong to as few planes as possible. (keyword "unbalancing the arena"

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Agreed. A experienced spit 14 pilot can be almost untouchable if flown correctly and at it's prime alt.( above 10k ) It's acceleration is unbelievable and it's vertical and sustained climb rates is something to be astonished by.
Ok, perk the 109K-4. Even more untouchable, because it actually is the fastest prop fighter 8 - 25k, and has twice the amount of WEP - it can climb with full WEP to 20k and still has some to fight.