Bump for the previous post (not only intended for David to answer 😉 )
And also:
Since my Laser CNC is much simpler that a 3d printer (no heaters, no fans, no multiple extruders or anything) I am thinking about the Duet Maestro. Are there any thinkable reasons to NOT do that and go for a Duet Ethernet? Perhaps in terms of computational power, memory limits that might prevent future firmware updates (sooner that other Gen2 Duets)?