So your strategy is to bring more boys and alt to a fight? You realize that strategy is open to everyone.
Including everyone in spixteens. Down that path lies cesspool-ism.....
Usually it's just more alt. Sure the strategy (more alt and more planes) is open to everyone, and I'm sure that's why everybody nowadays keeps complaining about getting ganged in the MAs. That's probably what you mean by "cesspool-ism" which has more to do with the horde than alt. I see the problem, and I've felt it. I've been on the receiving end being ganged by 5 planes to 1, and I've been on the other end and enjoyed it just as little simply because there was no chance in hell I was going to get that kill.
No, my strategy is not specifically to bring more alt or more planes to the fight. It's to wait until my opponent makes a critical mistake that I can exploit. It could be getting way too low, it could be showing me his six at the wrong moment, it could be taking on a 1v2, it could be him doing something newbish, it could be climbing at the wrong time, or it could be him falling for my rope. Usually if the fight is already a gang, I stay out of it.
In other words my strategy is to fly "smarter". I enjoy an ACM dueling challenge now and then, but to engage in one with a Spixteen in an "inferior plane" Co-E in an arena filled with people more than ready to pick you is just not flying smarter. I might show him a merge and gauge his skill level based on his response to it and if I see I can take him down quickly, I'll engage. If not, it's usually a waste of time.
It's a better counter to Spixteens than screaming about them on 200 or comforting yourself that it was "just the plane". It seems Steve and I agree on our philosophies on handling spixteens.

And back to the newb Spit16 vs average pilot Other Plane. Since we are not talking about the "best way" to fly them and we are not talking about ace pilots either, we'll assume both people make mistakes. Sure the Spixteen punishes mistakes less, but it also PRODUCES more mistakes. Since other people tell you it's an uber plane, the newb will be overconfident. Since it turns very well, the Spixteen will tend to burn energy quickly as its newb pilot attempts to haul his nose around. Since its climb rate is so good, the newb will use the Spixteen to try to follow somebody's rope. Since it's an uber plane, the newb will chase a faster aircraft and run straight into a gaggle of enemies.
I know because I've been that Spixteen newb before! Sure all these problems can be avoided if the pilot flies SMART (ding ding ding do we see a pattern here?), but we are again talking about a newb flying it. The average pilot may have a more uphill battle, but he's flying a "challenging aircraft" for a reason right? The reason starting with "ch" and rhyming with "allenge".
I guess my philosophy about these "uber" rides is: why blame something you can't change when there are things you can change? You could work on being a better pilot and picking better fights. If you can't handle those two... you could always just change back to the Spixteen yourself.
Nowadays if I get shot down by a spixteen while I'm flying my 109 or 190, it's pretty plain to me that I should not have engaged in the first place or that I should have disengaged when my advantage ran out. Then I hear the old Top Gun line running in my head: "The Department of Defense regrets to inform you that your sons are dead because they were stupid."