I's well known that the CA and RB are extremely similar engines in design.
It's also well known that the CA is notorious for killing bearings.
What no one seems to be getting here is that the rocker arms in the SR20 are not its weak point.
The hydraulic lash adjusters are.
Funnily enough, the CA and RB (except the 26) also use HLAs, and although not as pronounced, have the exact same problem.
If they did have solid lifters everyone would whinge because they couldn't just bolt in a set of aftermarket cams without a long and involved adjustment process.
Many very high revving engines use rocker arms. F1 engines, jap bike engines (mine does 14500rpm), Honda VTEC engines, etc.
Have a look at the internals of some time. The SR20 has a much more reinforced block (even being alloy it's heavier than a CA) compared to the CA, and much stronger rods.
Plenty of SRs have been making 250+rwkw with stock internals reliably. I know of one that's been running 260 at the wheels for quite a while with stock rods, and after a teardown the rods have been tested and measured and are 100% within spec. No damage at all. They are actually a very strong forged and shot peened rod straight from the factory.
One point that's worth mentioning too is that the HLAs are not a problem till you start upping the revs. On a high powered n/a engine you need revs to make power, but with forced induction you can just run higher boost levels. More boost is more stress, but lower rpm is less stress - so in the end you can make more power without excessive reliability problems.
An SR20's strong point is its midrange, so why not just extend that instead of trying to rev it past its optimum range?
Anyway, I'm not going to get into an argument, but I think people should sit back and look at the big picture. Revs are not the only thing, a big turbo is not the only thing, number of cylinders is not the only thing. With a bit of logical though you can see that the ideal path to more power is different for different engines.
Just because you'd change rods, pistons, valvetrain, crank, etc in a CA to make more power through higher revs doesn't mean you have to do that on an SR to make power.
Intelligent modification looks at the engine's stengths, and builds on those, rather than wasting resources trying to correct a perceived deficiency which, in the scheme of things, is not that important for 99.9% of peoples' goals.