Many users like the new "Elapsed" timestamp ("4 hours ago" etc).
Many users prefer the old "Exact" timestamps.
This should be added as a user-preference.
Possibly, it could be as a checkbox labelled "Use elapsed-timestamps in discussion pages by default" (or similar), under "Date-format" at [[https://www.mediawiki.org/wiki/Special:Preferences#mw-prefsection-rendering |Special:Preferences#mw-prefsection-rendering]]
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Sample discussions:
* https://www.mediawiki.org/w/index.php?title=Topic:Sdjk2ce202ud1fl0&topic_showPostId=sea6zofztwykiznq#flow-post-sea6zofztwykiznq
* https://he.wikipedia.org/wiki/%D7%A0%D7%95%D7%A9%D7%90:Sduwg1t8cd0k74s9
* https://en.wikipedia.org/wiki/Topic:Rp338uhkrre3jsht#flow-post-rp818vxsykuyt13y
* https://en.wikipedia.org/wiki/Wikipedia_talk:Notifications/Archive_5#Timestamps