The Jungle timer debate is a repeat of the MBS debate from StarCraft 2
For those who don't know, MBS, or multiple building selection, is a feature in most modern RTS games that allows players to select multiple production structures to queue orders. MBS did not exist in the original StarCraft, and players had to select each building individually to queue upgrades or unit production.
This changed in StarCraft 2, where players gained the ability to select groups of buildings at a time to issue orders. This caused a huge controversy, with many players and professionals stating that MBS would lead to a decline in player skill and damage the game, as it would simplify or remove a macro element that so many players had to do to play at a high level. Thousands of posts and articles were written about this, with many arguing for and against MBS. Ultimately, it stayed in the game, as Blizzard wanted players to fight each other rather than fight the UI, and they felt the lack of MBS was really just a hassle.
So, the game gets released and in a month nobody is talking about MBS. It definitely didn't stop StarCraft 2 from being a challenging game and an esport. In hindsight, the debate seems almost silly. Nobody who plays StarCraft 2 now seriously believes that having to individually select buildings to queue up unit production would significantly affect a person's skill.
I think the current controversy over jungle timers is almost an exact mirror of the MBS controversy from StarCraft 2. It's about fighting the UI vs other players. As a support who times objectives and other things, it's a huge hassle for me to have to manually scroll up the chat and have to look for the timestamp that I wrote. Having timers for things like jungle camps and dragons allows me to focus on the bigger picture instead of having to "fight the UI" and scroll through the mess that can be chat, so to speak. I think that after they come out people will realize that there is a lot more to player skill than writing "1425d" and that the overall impact will be minimal to nonexistent.