The comparison you're making is unreasonable: Nxt fundraising was cut off early, with no warning.
It was open for 2 months and was cut off on Nov 18 and was launched officially on Nov 24 with coins distributed to everyone who joined. You are correct there was no cut off announcement, but people could buy million per BTC for many weeks after the launch. Are you saying there were hundreds waiting for last minute? I doubt cut off announcement a week earlier would have made any big difference.
In my opinion, in no way is it acceptable to change the terms of a fundraiser without prior notice.