The situation: You did your B.Sc. and M.Sc. in CS with focus on subfield X1 and are now pursuing a PhD in subfield X2. There is a Masters program in subfield X2 available where you do your PhD that offers courses that allow you to advance in this subfield (which is pretty new to you).
Does it make sense to get a second M.Sc. while pursuing a PhD if the courses of the Masters program will be beneficial to your PhD work? Subquestion: Do you think it is even feasible to do this based on your experience?
The geographic context is Europe/Germany so a PhD does not include course work. A Masters (at a university of applied sciences) takes 3 semesters full time with the possibility to double that time when doing it part time.