There are three kinds of lies: Lies, damned lies, and statistics.
The idea that there is "nothing special" about the La7/Spit16 is one of the second type and whoever said it ought to be ashamed of themselves.

Okay, here is some of the 3rd type:
Late War Tour 108 Statistics for BnZs
Kills Deaths
Kills In Kills Of KilledBy Died In
A-20G 0 1 0 0
A6M5b 0 5 0 0
B-24J 0 5 1 0
B-26B 0 1 1 0
B5N2 0 1 0 0
Bf 109F-4 0 2 0 0
Bf 109G-14 0 1 2 0
Bf 109G-2 0 1 0 0
Bf 110G-2 0 1 0 0
C-47A 0 1 0 0
C.205 0 1 0 0
F4U-1A 0 1 1 0
F4U-1D 0 2 0 0
F6F-5 0 1 0 0
Fw 190A-5 9 2 0 6
Fw 190A-8 0 4 1 0
Fw 190D-9 4 1 4 1
Hurricane Mk IIC 0 2 2 1
Il-2 0 1 0 0
Ki-61 0 1 0 0
Ki-84-Ia 0 2 0 0
La-5FN 0 1 0 0
La-7 20 3 2 3
Lancaster III 0 1 0 0
Mosquito Mk VI 0 1 0 0
N1K2 0 3 3 0
P-38G 0 1 0 0
P-38J 0 1 0 0
P-38L 0 2 0 0
P-39D 0 0 1 0
P-47-D11 0 1 0 0
P-47-D40 0 3 0 0
P-47N 12 1 0 3
P-51D 4 8 4 0
SeaFire 12 1 1 10
Sherman VC 2 1 2 2
Ship Gunner 3 0 1 0
Spitfire Mk I 0 1 0 0
Spitfire Mk V 0 1 0 0
Spitfire Mk VIII 0 2 0 0
Spitfire Mk XVI 11 11 0 2
T-34/76 0 1 0 0
T-34/85 0 1 0 0
Ta 152H 2 0 0 0
Tempest 3 0 1 1
Typhoon IB 0 1 2 0
Wirbelwind 4 1 2 2
Yak-9U 0 2 0 0
86 Kills 31 Deaths
....Now I am not a trained statistician, but there are a couple of k/d ratios that stick out right there for me, especially when you consider I have used the SpitXVI and La7 exclusively for desperate base defense while pissed off and flying like a lunatic, instead of in a cool and predatory manner. Gentleman, I am not that good. The plane does make a difference. I'm not 100% saying they must be perked, I am saying there is some reason to the idea of perking them.
As to OPs idea though...all I can say is damn yer eyes if you think I ought to have to pay more perk points to fly X because I've been paying to play this fine game for awhile. I'd cancel my account if they slapped me in the face with something like that.