Flawed logic? It can't be any simpler.
Impact on gameplay? I'm not talking about one dweeb rides impact on gameplay. I'm talking about the Mk.XIV & XVI performance. They are two of the very best rides in the game performance wise plus they have handling to boot. My other point was that luckily they attract mostly newbies and those that like easy mode, of course not the Mk.XIV it died off when HT in it's wisdom
introduced the Mk.XVI perk free. Like the Mk.VIII has killed of the Mk.IX.
There are many things you have wrong here.
1) The handling on the Spitfire MK XIV is not at all benign. That you think it is just makes it clear you have never flown one, and given your derogatory attitude towards it you probably have a superiority complex justifying yourself.
2) How can you claim that it attracts newbies when it is hardly used at all?
3) The Mk XIV never died off because it never had significant usage. It started off dead. The introduction of the Mk XVI had no effect on the usage of the Mk XIV. Well, perhaps a few more sorties by the Mk XIV from people confused by the similar Roman numerals of the Mk XIV and Mk XVI.
4) The Mk VIII didn't kill off the Mk IX, the Mk XVI killed off the Mk IX with a very little help from the Mk VIII.
Same deal for the other top tier rides you mentioned, though those two take a tiny bit more skill to do well in. Basically point being that Spitfires other then for a couple of perk rides are the easiest modes in the game for getting kills in.
There you go again, proving you know nothing of the Mk XIV's handling. I won't argue your point about the Mk VIII and Mk XVI.
Hence I was originally laughing at the comments that the dweebfire isn't all that dweeby because of what ever reason they can come up with. Usually it's "Because I always fly against the horde" 
And there your superiority complex rears its head again.
18-23k Does anyone actually care about performance levels at this alt? If you can find something worthy to shoot at 20k+ have fun.
And the performance of the Mk XIV above 23,000ft is the only possible reason to perk it, but there aren't any fights up there for it. So why perk it for nonexistent fights?