That was an excellent video review of the Rev2, but Batt had quite a few criticisms of the instrument. I'm tempted to say those criticisms are unfair, in light of the origin and intent behind the instrument.
That may have to do with him not being particularly familiar with the Prophet '08. But then, I didn't really interpret his review as coming from someone who would have expected way more features. And in terms of sound shaping tools, one couldn't really ask for more, given that the mod matrix was basically doubled.
I'd say though that his criticism about the gated sequencer touches upon an aspect that makes it a bit harder to handle than it was on the Prophet '08. He didn't draw that comparison, but only hinted at it being a bit cumbersome to program, especially when it comes to note values and the overall dependence on the menu/display. I have to say that I found this to be realized more elegant on the Prophet '08, where 2 rows of potentiometers could be used for step value editing (on top of the extra LEDs that would show you what step you're on), which made it a bit more intuitive to operate.
It's all a matter of use cases and preferences though, and DSI tried to cover as many sequencer options as possible with the two types. There's also not an insignificant number of people who like the poly sequencer feature, which made it increasingly popular. I personally don't really use it on the Prophet-6, as basically my DAW takes over the task it is meant for and I like to avoid heavy quantization these days. I can still see why it's useful to have on a standalone unit, though.
Generally speaking, I prefer the capabilities of the gated sequencer conceptually, and also find it to be more flexible for note sequencing, as you can't just transpose a sequence on the fly with the poly sequencer (without holding down the record button that is). So if it was me, I'd given the gated sequencer the priority, mainly by keeping it implemented the way it was on the Prophet '08. But that would have probably also increased the production costs a bit due to the added LEDs. That's basically the only concern I can think of in terms of interactive aspects on an otherwise matured and loaded synth design.