The level of technical debt is also huge. So there is just tons of bureaucracy and red tape that you couldn't even make a big difference if you wanted to. The difference of working at a startup vs. a big stodgy company is just so immense. Not saying startups have it all right, but even if you are a 10x dev in the startup world, you would be amazed how quickly that motivation could dissipate working at a place that moves at a snails pace.