3. you can't also say to everyone else, we have mined 12.5% of all the current coins, but now we want that to be 50%
The initial 84mn formula with moore's law difficulty adjustment + annual reward halving, would produce
no more than 10mn coins. 84mn was the theoretical maximum. The practical maximum of the initial formula was 10-11mn, not 84.
This was then altered (after community consultation) to 84mn (due to the formula being too restrictive) which, again, after discussion and a poll took the final form of 22mn with 7% annual reduction.