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Interesting, I don't know if I have seen that approach before.  Theoretically then, faster hardware will tend to produce a different experience than slower hardware, because it will usually favor adding more ships over upgrading existing ones?  Have you done much comparison of older vs. newer hardware?

I haven’t done any hardware testing yet, but you make a good point. Ideally, the experience should be about the same regardless of what hardware one has. 

You could always split the difference.  Maybe if fps>60, alternate or randomly choose between a new ship and an accelerated one, instead of always spawning a new one.  That would close the potential gap a bit, and would also mix it up a bit more when performance isn't an issue.