Custom Document Profiles Lack Flexibility

When creating a new file, I typically prefer to set up my own preset details rather than using premade templates.

There's a (to me) significant hole in the ui. When you set up your new document you choose dimensions, number of artboards, bleed, color mode, pixel density etc.   

Having ignored the left side of the interface entirely, as I always start out by doing, at this point I still haven't noticed that the default starting document was set up for print, and this time I'm using RGB colors.   

Now my only path forward (if I want to get rid of the yellow triangle/ exclamation point symbol next to my color mode.) is to choose a new starting template and then change everything about it except the color mode.  

It would be much simpler to have the choice of a profile at the top of the right side of the ui (preset details).  I don't exactly know why it throws an error if you change everything about a document preset so that it works for rgb or cmyk. But if it's going to throw an error, there should be a dropdown that lets us choose between print/ mobile/ web/ film/ art.  

Maybe I'm just missing something obvious?