Sorry, James, not trying to pick a fight, but essentially yes , we will have to agree to disagree on this one. MOST players, no matter what they play, have a greater than 30 song repertoire. Korg, by limiting access to one's entire repertoire to 30 song chunks, have needlessly limited what the darn things are actually used for... As you said, if playing with sequences is your main reason to use a WS (rather than live band) "But if I was going to play over my sequences all night, I'd use a workstation" why would you NOT want a WS that could access ALL your songs instantly..?
"I have no idea why you are trying to compare it to the M50 which is a workstation. They are nothing alike."... Again, we'll have to agree to disagree

If you're goal is to play over sequences (rather than style mode, which, to be frank, is pretty similar in ways to the Karma functions of the M3), well, most arrangers can do this, too. And have sequencers close to as powerful (or maybe better) than the M3's. The line between WS and arranger is starting to blur away. When you discuss a WS that has similar functions and usage to an arranger, I don't see why they can't be compared.
Look, I'm not saying they are identical. But usage often is. Many arranger players use SMF's primarily (and please, let's not go down the karaoke route - we both now that using SMF's is only as karaoke as you let it be. A WS can be JUST as much karaoke, maybe even more), and just a bit of style play. But I can't see why WS players really are better off only having access to 30 or so songs at a time without having to do a HD load up. I used to use a WS back in the day just as you describe, and I can't tell you how much I used to wish for a WS that everything loaded instantly...
Then I discovered the arrangers, which, although I was still doing live band work and sequenced solo and duo work, were MUCH more friendly to the gigging musician, whether you used styles or not. I am STILL using my G70 in preference to my Triton and K2500S as a live performance tool, simply because of the friendly OS for easy setup creation on the fly. If I have two or three weeks to set up for a concert, then MAYBE, especially if it is a techno thing, the Triton and K2500 work out better. But if I get a call for a gig tonight, playing anything, with anyone, anywhere, the G70 will be what I grab.
The only reason more WS players don't use these things is prejudice and lack of availability to demo and try out, IMO... If they could but see how much easier much of what they actually do is on the arranger...