[thedufer]

"You don't have to follow this exact formula but the basic idea is that you set up "stripes" of seniority"

He makes it pretty clear that that's an example and might not work for everyone (for example, if your hiring doesn't accelerate like that you might end up giving stripe 1 and stripe 2 hires the same number of shares with the suggested distribution, in which case you'd obviously want to move towards something more like your suggested 40-30-20-10).