It can been a good thing, cause I seen a few people forget how many kills they have in the flight. However I personally have no problem counting my kills. Just imagine real life, it does not even say SYSTEM: You shot down Stokes #7 (lol) or anything like that.
The way I see it, if your plane is not damaged and you have ammo & fuel you should fight, if not RTB. When you re-arm...well...1st thing that you need to do is count how many holes you have in your plane and where they are, if you have 0 or a few in a non structurally important part of the plane and your planing to take off from the same base on the same plane and with the same amount of fuel and ammo, just re-arm, you'll get more perks when you land more kills. If not, end sorti.
How ever, if you do have alot of kills, you might want to end sorti. Like for example, when I come back home on a perfectly good airplane and have 7+ kills, i don't re-arm.
Still...would probably be a good idea