Correct opinions Brad. Agree entirely re: the Wacom vs this pen!
I think you are right about the ecosystem thing, it would be a great workflow for you if you could do the pencil sketch on rM given it's limitations, and then ink and colour on the Samsung S10 or other pro drawing. But it would just frustrate you to export and import into different software!
Have you used the SVG export much, is that useful for your work?
Glad you are still using the Boox Note Air, says a lot about that experience!