having only one (low) cpi step surely makes things easier. for one, as you suggested there will be less need to come up with ways to battle excessive noise.
that's why i mentioned the "dpi war" earlier: companies going for interpolation, getting more noise/jitter by pushing cpi, implementing smoothing to counter it..
i can imagine that with all that processing going on, it becomes harder/impossible to get cursor movement that's low-latency, low-jitter, and accurate.
the main issue is probably just that if all this stuff is needed at all to achieve high cpi, and if high cpi comes with such high a cost.. then the sensor probably just isn't suited. (3360 or go home!)
things were just simpler in the beginning, i suppose. why bother trying to come up with a way to get 800cpi on your mouse when everyone is running at resolutions like 800 and 1024, you know?
and of course the fact that those mice were optical, and not mechanical, was reason enough to get a mouse like it.
few of the companies could/can really handle (the pace of) the dpi war, in my opinion.
rather than trying to come up with ways to get decently high cpi while cursor movement remains "sharp", they prioritized maximum cpi and other "gimmicks" (lighting, more buttons, etc).
in my opinion the high cpi came with too high a cost. but luckily for these companies, the average consumer doesn't care about or even see that cost.
(i realize that cursor precision isn't the main concern for every kind of mouse, but of course i'm primarily talking about gaming mice.)
edit: also, the gaming peripheral market has become quite a silly one over the years.. for example the 3310 received a huge hype-bomb, which never really stopped exploding, and now there are so many people thinking and claiming that it's such an amazing super fantastic sensor, that every new mouse that uses this sensor automatically gets 4 out of 5 stars.
i can not un-forget that TekSyndicate themselves claimed it's the best sensor on the market, after the 3360 was already publicly available.
you could argue that them claiming that is just marketing, but i consider it laughable.
(but finalmouse is probably the funniest company.)
/rant
numbers sell
edit: again thanks woll3, the insight and detail is always appreciated :-)