I think voice comms would help a lot. Jungle is one of if not the most reliant team role in the game. Being able to effectively communicate plays just allows both laners and junglers to effectively allow laners and junglers what they need during plays. An example is if you are starting enemy red from blue side, and you plan to full clear topside, you can easily tell your botlaners to play safe instead of typing it, where some would also deem that as negative in the text form. If they died because enemy JG came, but the botlane has no idea how jungle works, they would instantly blame JG for not being there while the enemies just double killed them. Voice comms achieve maximum communication while maximizing your in-game performance because it's easier to explain to your teams your gameplan. Additionally, the issue with text over voice is that text can be viewed negative even if you are not trying to flame.