So I got it!
The concept is brilliant but in just a couple of hours I've run into some bugs and some frustrating unexpected limitations.
Most bugs (so far) are related to using it in 4K in Windows. Things like tooltips and right click menus being so small to be almost unreadable or the plugin window resizing every time I open it.
I've also experienced other little bugs like the delay not working properly when using it in LR linked mode.
I've contacted Izotope, let's see what they say.
As for the limitations...
So you have this MSEG editor which doesn't have any "brush" like ShaperBox or other similar plugins. If you want to draw something like a S&H stepped curve you have to go at it point by point which is quite tedious. None of the videos I saw went into detail about how to actually draw the curves and I assumed (my mistake) that a $200 plugin would have that functionality.
There's no way copy and paste curves from one parameter to another. If you apply an MSEG to the filter and then want the same curve on the distortion your only option is to save the curve to a file and to load it. You also don't have a UI to see your stored curves. Good luck to find the right one if you end up with bazillion curves in that folder.
Another frustrating issue is that there is no init "patch". You can start with a clean bank with clean gestures, but these (supposedly) clean gestures have curves in all parameters that you have reset one by one and takes a number of clicks.
All these seemingly small details make your workflow quite slow unless you avoid the MSEG altogether and only use fade modulations.
Also, AFAIK, it cannot be used as a send effect in MIDI mode because whenever you release a key the dry signal comes back. You can configure the dry signal is always on, but this means that, if you want to apply an effect after Stutter Edit, it will be applied to the dry signal too. This is not the case when using it in auto mode (when it loops itself without MIDI notes) but it's kinda of a bummer.
There are also plenty of missed opportunities considering this is intended for live use. The timeline override setting from v1 was removed. Also there are no "global" modulations. It would be great to have LFOs that run independently from the main loop, or random values that can be applied whenever you press a key much like you have in Zebra, Hive 2, and other synths. Not even note velocity is used.
Oh and also, other than the global filter, there is no automation from the DAW.
Don't get me wrong, the plugin is plenty powerful, but I expected a more polished product.
Edit:
Another limitation I've run into. The buffer always starts at a fixed point.
For example, if you press your key when the snare hits in the second beat of your bar, Stutter Edit will actually start playing the kick drum from beat 1 at the start of the bar. I would have expected the buffer to start when I pressed the key instead to be able to stutter the snare or whatever is playing at the moment.
In the buffer effect you can define a different starting point in the recorded bar, so to speak, but this is always fixed in the gesture and not dynamic with your playing.