> relies on the efforts of software engineers to design and build your primary products, they should have the primary equity in the company.

The average tenure at Google is 4 years. This means that most current Google's have joined when the company was already at sky high valuation. They made incremental improvements to the product line. But arguing that they should own the majority of the shares is just ridiculous. Think about it: if google had made no new development in the last 4 years, how much would it still be worth ? The answer is: not as much as today, but probably quite a lot.

Current employees thus deserve a part of the pie, as they are the one tending for it. But when they joined the pie was already very nice, and they had 0 impact on that. Not with their work nor their investment, so they can't claim that part for themselves.