I think I see at least part of the problem here
Do you play on low graphics settings? Because all of those things you are saying are fires, on things such as the IL-10 and F4U, are not fires. They are the particle effects from hits on the plane and things breaking off of it. There was no fire on the IL-10, It was the explosion effect of the tail being ripped off, and the small little trails of fire are the incindiary effect from the rounds themselves.
The Su-6 died literally because he was riddled with holes. .50 cals often do that, despite your heavy protests they don’t.
The Do-335 I added in mainly as context for where the assist came from during the FW-190 clip, but the severe on him was due to damaging his engine, he floated around for a little bit before the friendly SPAA finished him.
The P-51D in the last clip is the only one that I let burn out to die. But someone that has at least 2 fires, one of which being an engine fire, is just as dead as someone missing a wing, more dead in fact because significantly more planes in war thunder make it back to base with missing wings than they do with burning engines.
The Yak9K was there partly because again, this was just all my kills in one session in order, but also because you’d never believe it, but I am someone who actually flies mostly cannon armed aircraft, the number of times Ive had enemy planes do the same thing after being hit by 20mms is just as often as I have had it in the last few days flying .50 cal equipped planes. Heck, if that P-51 had 20mms instead of .50 cals I wouldnt have even HIT that Yak9 in the first pass, I was barely able to get the nose on to get hits with the .50s, 20mms would have fallen short.
As for the rest of the kills, we are back again to “The damage the .50 cals do, despite being killing just as quickly and consistently as 20mms, is somehow the WRONG damage and is thus worse than 20mm damage, therefore I am right and you are wrong”.
You are also still counting one of the biggest advantages of a set of .50s as a disadvantage for some reason. Being able to spray rounds at someone isnt a disadvantage, its the best advantage you have with those guns.