Sometimes an OP changes their mind and awards the accepted answer mark to another post. Sometimes they don't know you can only mark one answer as accepted, and click the big checkmark next to each answer on their question without realising this un-accepts the each previous answer at the same time. The old timeline view would show you that this happened, by including accept un-accept events as separate entries.
The new timeline, spiffy as it is, doesn't include unaccepts and only shows the most recent accept vote. I'm really missing this information, it was one of the very few reasons I used the old timeline in the first place.
This is especially important for moderators, where we sometimes have to diagnose fraud where an accepted answer was plagiarised and the accept mark shifted over to the new copy. Having to hunt through the victim reputation history to try and piece together a timeline of events is so much harder now.
Can the new view please show all accepts and include un-accepts again?