That's not to say that you can't design more equitable arrangement within the current system. For example, you can allocate an order of magnitude fewer shares than are issued, and each quarter do equity "bonuses" of an amount totaling 1% of the allocated shares so far. In other words, ownership percentage of the company for founders + employees would decay with a half-life of about 17 years. (You'd need protections of investor shares against this dilution to make it acceptable of course.)
You can play with the numbers of course, but the idea is to have long-term ownership reflect an employees honest contribution (determined by relative bonus size vs. the size of the company), and eventually over time even out disproportionate allocations from early on.
Other systems are possible. The fact that founders and investors don't explore them is easily explained: the current system is heavily weighted in their benefit, so why bother?