I easily waste 10 minutes per online support chat waiting for the agent to deal with the 4 other cases they are on, fixing my typos because typing is worse than speaking and dealing with the context switching that comes from doing other stuff whilst waiting for them to respond.

Much better to start the call, get through the menu and then put my phone on the desk either on speaker or with a hands free set and doing something else whilst waiting for them, once I get the person on the phone I can then focus on the call and not other things.