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Good point. I can't speak for the but I can say that the numerous discussions that followed that proposal pointed out various problems with the idea of a modified linear curve. It may be that the problems they were attempting to solve with that approach were not worth the additional problems introduced by it, as well as some problems which even a modified linear curve does not solve (in terms of the latter I would identify influence for smaller stakeholders remaining very small). But I can't speak for them, perhaps they should just explain better.

I totally agree with you @pfunk on this one. I thought it was odd when I saw this announcement without the reason why Steemit inc was previously hesitating to implement a linear reward curve. It's a good thing you asked.