While in the ideal world we would have 6 classes all 200HP apart and lots of choices, the world isn't perfect. It would also be nice if the OEM driveline could withstand anything we threw at it, but it won't.
There comes a point where OEM driveline dictates where a logical break should be and that's where there will be a HUGE jump in HP (if you think about it logically, it only makes sense).
Watching gasser classes in the past tells us that at a certain HP (and alot less torque), the OEM driveline does not hold up. The issue becomes as the HP "creeps up" guys slowly upgrade parts. A driveshaft here, a yoke, there, a beefier axleshaft, etc. until the ENTIRE driveline is aftermarket BEEFY parts. Yes, certain guys will be able to throw just about anything at it with a x.x charger, but add up the bills and you will find open driveline would have been cheaper from the start. Guys who have been in it for years spread that cost out and it doesn't seem like a big deal to them, but those wanting to get in and compete have to shell out the money for a strong engine, but also for each and every upgraded driveline component (if not a busted axle off the line at ONE pull can take you out of the points). It becomes a stagnant class or a class for deep pockets. It actually gets to the point where it less HP, but costs more money than the class above it. That's not good for the class or the sport. The only ones it benefits is the guys currently in it and "up to date" in the upgraded parts department, which is selfish. Many guys like it though as it limits the competition.....less guys they have to worry about.
The guys in 2.8 found out that the OEM drivelines weren't up to the task (without a ton of bigger and/or aftermarket parts), and that was with old turbo technology. Some of the new protrusion 2.6 chargers are right where the old 2.8's were......
Think about how many 2.6 guys have already had to install large diameter rear axles, upgraded driveshafts (with bigger yokes), upgraded transmissions, etc. etc. I even think I saw a front axleshaft GRENADE on a DMAX in the Eaton video. Where does it stop. And as you know, once you give pullers an inch, they don't like to give it up. Easier to limit it now and take a little away, then to try to take a bunch away later.
Lets learn from other's past mistakes instead of repeating them.........