So I responded with just “I will give it some thought” which is true and brief and avoids a text conversation about this complex issue (which does not ever work well for us).

I am giving it thought of course. When we discuss it, I feel like saying that I am not comfortable with this at this point, but that I recognize that it will be a reality down the line.
I feel like also saying something like “I’m hearing that you are looking for more autonomy as a parent, and I see why that’s important to you. Knowing that it’s important to you, there is space for that.
I think that you tried to let me know you needed more autonomy with D4 while we were together, and I failed to hear and support that need. If I had it to do over again, I would do things differently around that.”

This feels like a good opportunity to validate the feelings behind this and other recent requests. Thoughts?