If you want to see gimmicky just look a the evolution of the automobile. Pretty soon we won't even have to drive if we don't want, then it will become that they won't let you drive on a public road because we will have become so incompetent at driving from no practice that nobody will be trusted. The only people that will really benefit are the blind and severely disabled (which is a good thing).
I see some parallels in diving. If you look at the invention of each incremental item you will see that it was developed to either make money, solve a skills problem (allow more people into the sport who otherwise wouldn't be able to cut it) try and reduce task loading, solve some sort of safety issue, or increase physical comfort level.
So things like the BC - solved the problem of wetsuit squeeze and heaviness at depth. Many variations of BC's were toyed with before the modern poodle jacket was finally invented. Why did the poodle jacket stick?.. Comfort, looked nice in the store, cozy, pretty...You have to realize the "new" diver that they were catering to also. Does it work the best, certainly not, not in my opinion.
I think the modern bcd one of the most gimmicky pieces of gear that has been distorted and warped very far away from what it really needs to be. I think the reason for this is because it's one of the things that's very easy to be fluffed and added to with more gimmickry.
A tank can't really be fluffed and added to, for excetion of creating bigger more high pressure tanks but to me that's good.
A reg is basically the same over the last 40 years and can't really be added to internally although some of them continue to try and impress with fancy outer coverings and big prices (the "must be better if it's more expensive" mentality).
Masks have actually become simpler and better. They are now more low volume and simpler than at times in the past. The freedivers can be thanked for that. I'm not seeing the big multi window jobs like I used to see.
They've tried to fluff fins or come up with different ideas, but it appears to me that the basic ones still win out. Fins are one of those things that people have direct and immediate feedback from. Splits are actually losing favor. For instance, a large chain in Southern California has discontinued selling them and sells regular paddle fins again.
Computers are perhaps the most controversial. They do relieve a task load but where is the line between a valuable practical tool and a huge gimmicky waste of money?
CCR's - No comment, I know absolutely zero about them.
So what's next? There's already talk of a computer controlled BC that adds and dumps air automatically so you don't have to touch any buttons or do a thing except just go where you want. It keeps you neutral throughout the entire dive.
Are there going to be propeller boots next? With these high power long range batteries it's probably possible. Then people won't have to fin anymore. Scooters have done a pretty good job of that already.
I'm not really a fan of all the gear (as people might have gathered already). If I had a way to remain down for an hour freediving on breath hold believe me I would. However that's impossible so I need some form of S.C.U.B.A.
I really like the dirt simple approach and have made a conscious effort to eliminate as much as I possibly can to increase my pleasure of the sport. I didn't think being stuffed into all the gear like a sausage and then having to clean all of it was very much fun, kind of took away from the joy.
So looking at it that way anything beyond just holding onto the tank and breathing off the valve would be gimmicky, but lets be realistic.
Like the Russians say, "Man can't live on Vodka alone".
So I'm of the school, KIDS (keep it dirt simple)...and have fun.