If you made the change from exclusively breastfeeding to exclusively pumping can you tell me why and what your experience was?

I have been breastfeeding mostly except for when I had to pump in the hospital when my baby had to supplement and now when I can’t be with him. He is only 3 weeks old. Breastfeeding has been going well and I wanted to keep going, but it is a struggle. I like knowing measurements of pumping, I will have to pump when I go back to work, it is still breast milk so it’s healthy, and I get a little better schedule I think with pumping (I keep having to leave to breastfeed and it takes so long that I am struggle when we see family).