Given then many of us read your pro-parenting description as condescending, I'd say it was your issue not ours.
Well it was badly worded, certainly not meant to be condescending, but I don't have an issue with it.
But what exactly is pro-active parenting? I'm "there" for my kids but being "there" every second of every day is detrimental to their health no?
Not that I am aware of. There are thousands of families who have a parent in the house all the time, I'm not sure what impact it has on the child's health.
At what point s you intend to let your children gain some independence?
Gaining independence isn't about being alone. So many people think absence = independence. It doesn't. One of the most important factors needed for independence is security.
What age do you intend to let them be by themselves, or wake up to you not being there?
I don't think my DC have ever woken up and not had a parent in the house. It's never been necessary. They have managed to grow up into independent, fully functioning young adults despite this fact.
Serious question. I'd like to understand what it is that proactive parenting is versus what everyone else is doing...
Well everyone does thing differently. For me, being there is important. For others, not so. It's reasonable to accept people are different. OP asked about leaving the DC alone, for me that's a no.