You can call it overreaching; I don't mind. But you just disqualified yourself from a big chunk of otherwise interesting jobs. It's not like I'm making up the fact that software startups have non-negotiable IP clauses.
You want a really fun non-negotiable clause? Come up with something "patentable", then quit. You can be forced to work on the patent application, a year later, at a rate set by your ex-employer. Happened to me.
Well, so yo should have kept it to yourself to preserve your own best interest. That's exactly the problem with that situation, it stimulates you to work 9-5 and keep quiet about everything and anything. I think that situation is broken.
And it's strange how you, an apparent victim of the system, come to its defense. Doesn't compute.
You want a really fun non-negotiable clause? Come up with something "patentable", then quit. You can be forced to work on the patent application, a year later, at a rate set by your ex-employer. Happened to me.