I completely disagree with the fact that "EVERY" wrestler should have a submission finisher to improve the look of their move set.
First of all, not everybody is gonna look so much better with or without the submission finisher, John Cena has a submission hold, people still shit all over his regular move set, and Chris Benoit had two submission holds (Sharpshooter and Crossface) and I think if they had given a regular finishing move to Benoit, people wouldn't really have cared, cause he was still a beast in the ring, same goes for Kurt Angle.
Certainly you can say "oh but it adds something to their character" yes it certainly does for John, Benoit and Angle, but it doesn't necessarily add anything at all for a guy like, say.. Edge, Christian and John Morrison.
Secondly, as I mentioned above, Edge, Christian and John Morrison wouldn't need a submission hold to remain entertaining and have a great move set, Edge's match at Wrestlemania 26 showed he didn't need a submission hold, Christian and Morrison proves it every night.
But, I do admit there are some, while they don't need a submission hold to have their move set seem more awesome, I wouldn't mind seeing them use one, and Jack Swagger is a great one first off, I liked the submission hold that kinda looked like a Crossface Chickenwing variation, and I would love to see him use that as a regular hold, Jack has proved as of late he's has quite an array of submission holds, the move he put on Undertaker could possibly work too, as a regular submission "I'm wearing you down" hold.