The timestamps would not get displayed when entering the history command (only when entering e.g. history -t). Having timestamps (that are enabled by-default) of when the commands were run can be useful for many reasons like reconstructing what caused a problem in the past. I'm surprised this hasn't been implemented yet. For example, I recently noticed that bash_history entries were missing and via backups could determine the timespan during which it happened. Having timestamps in the bash_history would allow one to easily find the commands entered quickly before the history was lost.