I think it's because the issue blockchain was having in past has been fixed and now transactions are confirmed very fast.
Let's see if this happen again in future.
well those days are long at the moment because the blocks are very full nowadays and in the future it will be even harder to get your transaction confirmed really fast, though if the segwit gets activated the problem would be solved really easily and even if the segwit does not get activated we need to do something about it like allowing bigger blocks because without it bitcoin will be less and less attractive for people.