That doesn't matter as it's only used as a boundary check and the majority of devs that fork others code are too lazy to change that. Plus, I think it would mess things up due to POS. i.e. if that was set at 900000, then POS coins would probably not be generated and since you don't really know how many would be generated, you can't really set that to a "real" number.
The actual proof of work code determines how many coins are generated.
devs should care maybe more. Because these codes are alarming. It's a boundary. So that it doesn't allow anything more than 1500000 to be generated. The it could have been set somewhere like 1000000. If someone says MAXcoins 900000. Then they should probably set the max allwed to 900000.
Just saying. NO fud. I have no personal interest here. Did not invest, and will not invest.