So I'm still curious.
So in SketchUp you have "dedicated" guides that can be drawn via coordinates from a designated position. You can copy them and you can lock them.
My main issue with the construction lines is that they can still be deleted via selection or using the trim command. What exactly does the "fix" command do if it doesn't protect them from being cut, or deleted? The only thing I've noticed that happens with construction lines is that they don't interfere with the creation of "divisions" of space - meaning you can't extrude the area that may be divided by the construction line, whereas regular lines do. Additionally, construction lines, even when fixed, still interfere with overlapping lines which becomes very annoying - especially when you use trim often.
Is there something I'm missing with construction lines? Or is this simply all there is in Fusion when it comes to things as close to guides as possible? I find planes to be very useful but guides that can be locked (until unlocked) without having any kind of possibility of interference with them would be amazing. One amazing thing with planes is that they act the same way as guides in SketchUp and it would be amazing to have this available in the sketch profile.
Is there a way to suggest this as an addition for fusion? Seems it would be an incredibly easy thing to add (Heh clearly I'm ignorant in programming).