I have been a CAD user since about 1990. I used Robocad for a number of years and eventually migrated to AutoCad LT. Later on, I used a clone of that. In the early 2000s I became aware of Sketchup and used that alongside AC, initially as a bit of a toy but also to help explain tricky details using its 3D capability. Then I started reading about people like Nick Sonder who managed to use Sketchup as his only CAD package. I have done the same since about 2015.
I imagine most people who migrate from what are essentially 2D drafting packages to SU do so in part because SU is so intuitive and in part to leave behind the frustrations of working with Autodesk products (aimed, I am told, at engineers, not architects). But of course there is always an element of “out of the frying pan into the fire”. SU has its own frustrations, such as a lack of true curves and the very severe limitations of Layout.
My experience has been that it is entirely possible to use Sketchup for everything and it makes life simpler overall if you do. But there has to be a point of commitment where you make the leap and leave your old life behind. Riding both horses just doubles the pain.
One thing to be aware of is that SU is very easy to use badly and using it to its full extent does involve a learning curve.