I use a 2019 MacBook Pro for my design stuff which is probably overkill. In my shop I have a 2013 MacBook Pro that I run everything on, including some editing of the graphics I’ve designed. I think it doesn’t hurt to run a slightly beefier machine for the graphics portion. You can do most everything on the workflow side of things on your design computer. The machine computer/laptop doesn’t have to be too beefy. If you use one laptop for both - just make sure it will run your graphics/CAD/CAM software.
I should mention I dual-boot these machines for Windows. I use Adobe Illustrator, Inkscape, Sheetcam and of course MACH 3. Only sheetcam and Mach 3 won’t natively work on OSX.