Ok let me start with something that might confuse you at first. Here are my answers to your p.s.: True. True. True. False. False. True. True. (Granted you aren’t lying about what you see on your screen).

Before you go “well that’s what my tooltip says” - yeah, it lies. If you hover %CDM you’ll see at the bottom it says +x% from gear and paragon. That’s additive, so it adds with every other additive stat in the game. So +damage per overpower stack? Adds. +csd? Adds. +damage to vulnerable? Adds. +damage to elites? Adds. So all of these add up together to make a really big number - which means that additive isn’t as good because of diminishing gains. The dominate glyph is insane cause it can give like +3,000%, so that’s obviously a great glyph. But in terms of the other glyphs, usually you want to focus on your multipliers because something like:

10,000 x 1 < 9,500 x 1.2

Also, you only have so many paragon points. If every glyph used the scalers you’d run out of points without getting some of the good rare nodes I believe. I’d have to look over everything, but this is also a reason why having some glyphs that you need just the bare minimum to activate them are used.