Hi Tjark,
I am running Mx Studio Pro also on a 16 GB RAM machine. Sometimes I also use Adobe XD in parallel with Mendix, but only the final prototype not the Adobe XD studio itself. This combination is working fine for me.
Mendix Studio Pro + Runtime usually take up to 1-2 GB of RAM for medium-sized projects, PostgreSQL server is almost negligible. So there should be plenty of RAM left for other Apps and projects.
Hope that helps.
BR,
Alex