I don't think it's arrogant, and maybe I expressed myself the wrong way. I'm only speaking from my experience. All thoses plugins helped a lot in the past, and are still helping me today.
I totally agree with the fact that all the tools that those plugins offers could be implemented in SketchUp, but I'm not sure this is the good way for two reasons :
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Not everyone needs all the functions that those plugins offers, and SkecthUp is aim to be a simple and intuitive software. And for this, the native interface and tools panel of SU are good.
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Then, all thoses plugins can slow down the system and make it unstable sometimes, as you mentioned.
I'm happy for you that you success to make big and detailled model without any plugin. But just tell me, what should I have to spend three hours on a work, that a plugin is able to do in 5 minutes, and as a landscape architect, I can tell this is often the case...
Then, you tell that a well designed cad system shouldn't to have externally developped tool plugins : I think this is arrogant. Because telling this, is telling that people who makes software are "gods" and all those great guys working and adding essential functions through plugins are just foolish guys, don't you think ?
The time where all software makers worked alone in a closed world is over, today the community is here to help people and software makers.
Without any arrogance and animosity, see u soon.