Understood. It’s another case of GIGO, meaning, if you want to know where finishes are and dimension to them, you need to draw them, and if you want to know where framing is and dimension to that, you need to draw that too. BTW, it astonishes me what passes for acceptable in the world of mail order plans. Walls are dimensioned as 4" which isn’t correct for either finishes or framing.
I agree the problem comes to editing and making changes. If finishes and framing and what not else are all isolated in there own groups, it’s a pain to do something like make a wall 2 feet longer. In my 2D CAD program, I’m used to a “Move Points” tool that ignores groups when moving geometry. After decades of producing drawings in this program and using this tool constantly, I really miss such a tool in SketchUp. There are a couple plugins along the same lines: Fredo6’s FredoScale and Tak2hata’s T2H Stretch by Area
There is Medeek’s Wall tool. Still in development, he’s doing parametric wall building within SketchUp and seems promising.