When she said that “we shouldn’t change things because the kids were used to this routine.” I simply explained to her that with her moving out the kids and I needed to learn what the new normal would be. It wasn't necessary for her to come to the house, pick the kids up and take them to school because my new class schedule allowed me to do it. I really wasn't putting it out there as a consequence but just simply as a life if going to change, our family dynamic is going to change, and I’m not going to simply continue doing what we have been doing. Am I wrong in this line of thinking?
No, your line of thinking is not wrong, IMO. You gave her an explanation without really rubbing it in her face as much as a lot of H's would do. I think it was a good answer.
Here's the thing with a WW in an A, she wants everything that she likes to stay the same......as long as it is convenient for her. Family events, child care (school, overnights, weekends, holidays, etc.) scheduling, etc. But don't expect her to be consistent, even if it is according to her own scheduling. And, of course.....she still expects her H to pay for everything he did when she lived with him. Moving out, for her, had no bearing on you paying her expenses (in her mind). It is just so crazy.
Very few are able to reason with a WW, so just know what you need to do and stick to your plan. Be braced for any and all surprises she may pull. Get legal and financial advice and protect.....protect....protect.
Separation can work in a positive way for some. It gives you a break from a lot of stuff.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!