Having the time on your bar on your computer screen is convenient because you can look at it, while you're typing and know what time it is. If you have to click on the changes tab, you have to leave where you are and go and search for it. Imagine, you come to the == Research notes == and someone has left a message that they looked but could not find a source. When did this happen? If you're 3 monitor lengths down because it is a long bio - you have to scroll up (action 1), then click on changes (action 2) then scroll down looking for the change (action 3), but wait, you don't know what change it was, so you have to click on the first change and then go back, change by change.
If the person wrote, "Can't find a source at this time ~~~~" you'll see:
"Can't find a source at this time 00:23 - 22 September 2018 SJ Baty."
Any time you're posting to a profile and you want to leave "your mark" + a date stamp, this is what you want, 4 tildes: ~~~~
Also very useful for if you're 1/2 way through a bio and you get called away.
... and then Reverend Smith moved to Missouri. He and his family can be seen on the 1880 census[13]. ~~~~ Called away, will resume within 7 days.
Everyone reading can see that you're working the bio and you'll be back in a week to finish it.