I think the problem is trying to make things what they are not. In this case, having SketchUp be a professional 3D modelling software when it is not… First of all, it was not born as one, although it was intended.
When Google acquired SketchUp roughly six years after its creation, it was automatically doomed to be a hobbyist 3D modelling tool. Google wanted to 3D model each building for Google Earth but it was too much, so they bought SketchUp and gave it out for free! Does that sound like a professional 3D software to you? Nope.
Regular people (aka not professional 3d modellers) were using Sketchup to model all sorts of things, including buildings and landmarks to be integrated into Google Earth.
This is the kind of 3D tool that has the reputation of being the program you introduce to your 70 yo grandma so that she can have fun modelling her house. Clearly not a professional 3D suite.
Sadly, and as it has happened with many old software, it became very popular and industry standard.
I agree with OP 100%, the reason why some people on this forum and people like your boss promote SketchUp so much as is exactly because at one point in time it was very popular and became industry standard for lack of anything better. They have been using SketchUp since they were working for someone else and it is all they ever knew and will ever know, and thus think its the best tool.
I am pretty sure that if a poll was made, 80% of the people who promote or praise SketchUp are +40 year old. Most young 3D modellers, architects, etc who have experience with other 3D software come to SketchUp and can’t believe the amount of basic functionalities that are lacking. There is honestly no point in discussing this because it is self evident. The program is extremely behind compared to contemporary 3d software.
I could do an infinite list of basic functionalities starting with ‘export selected’ continuing with ‘3d gizmo’ and ‘extrude in user defined direction’ and ending with ‘uv mapping’ and ‘import .obj files’. Add ‘multiple viewport’ in there too. It honestly goes on forever and most not even extensions can solve.
When you compare SketchUp to tools such as Rhinoceros3D, Cinema4D, 3dsMax, Maya and even Blender, its as if you were talking about a kids game instead.
And what is worse, this would give the impression that SketchUp is easy and intuitive, but as many experience users have said in this thread, they get tons of basic questions all the time. Guess the software is not so intuitive after all no? I think a funny thing has happened: the software used to be easy and intuitive, after all it was one of the earliest 3D software out there, if would often be the first time in 3d modelling for most. In present day, with many more options available, SketchUp might not be your first 3d modelling experience, and when you pick it up later, everything is counter intuitive. Cumbersome, prehistoric, repetitive, inefficient.