Value of vector if no copy/paste selection???

I just spent a few months learning Fresco and moving artwork from Procreate to Fresco, mostly on excitement of vector brushes that would allow me to enlarge artwork with no loss (and wider brush selection).  Now I realize that if I wish to do any copy/cut/paste of selections while working, I have to convert to Pixel.  So, in what scenario would I ever actually use Vector brushes???? Are there artists who create an entire finished canvas without ever using copy/cut/paste of a selection?  Have I misunderstood the whole intent of the vector brushes?  Please clarify!!!!