Also, I don't bring this up with them obviously but do wonder how they feel when during my time I'm 100% focused on them whereas ExW has other priorities to balance.
Well, when you were married, neither of you was 100% focused on the kids, correct? You balanced kids time and couples' time. I'm okay that my son and daughter sometimes don't have me planning events, feel bored, and have to figure out how to entertain themselves. XW's decrease in focus on the kids may be partly or wholly made up for by OM's focus on the kids? One GF I dated was an amazing influence since she fielded questions about tying up hair and menstruation my XW would not. There are a lot of changes in dynamics to get used to. It's hard at first. I'm glad she was able to give you more time with your kids than you expected and hope OM is more benefit than problem for your kids.