I agree with
@Reku. Having individual 18650 batteries that are user replaceable would definitely be preferable to me.
One of the big knocks some people have against inexpensive Chinese-made lights is that the quality of the battery cells is always suspect. A light needs a long time in the marketplace with a lot of user testimonials before the broad audience of divers that use canister lights would trust any given light (from a Chinese brand that isn't already widely respected in that tech diving community). A simple burn time test is not enough. Tech divers want to know that when the light is a year or two old, it will still have a very low self-discharge rate and and still have a long burn time.
Being able to use my own 18650 batteries would mean that I can KNOW the quality of the battery cells I'm using. And, the light would be less expensive to purchase (presuming I would buy it without batteries - which I would, since I already have a stockpile of good quality 18650 cells). And, of course, I can replace any individual cell if/when it goes bad.
Companies like Underwater Light Dude, Light Monkey, Halcyon, and Dive Rite are all well-known and well-respected. People in the market for a highly reliable, long-burning canister light generally accept that those brands will have high quality batteries in them and so they don't mind that those lights come with what is essentially a proprietary battery pack built in. The OrcaTorch name does not carry that same weight in tech diving circles (as far as I know, anyway) and I don't think people are nearly as likely to accept it on faith that an OrcaTorch proprietary battery pack will be long-lasting and highly reliable.
I was really looking forward to a new and improved D620. But, if I have no control over the batteries that are in it, and it's a fair bit more expensive than the D620 (because I'm also paying for batteries), I am not nearly so interested in buying one as I once was.