This is my primary issue with async communication. Ive had email and slack conversations which lasted days where there was a 4 hour gap between messages and it is horrible.
In a call you can't be ignored or left on read for 4 hours.
4 hours is a perfectly reasonable response time for an email. It’s not IM
> In a call you can't be ignored
As someone on the Autistic spectrum... yes, yes you most certainly can. When you're speaking I'm (not necessarily voluntarily-)daydreaming about my current hyperfocus/obsession. I'm tuned-in just enough to not reply with something so far out of left field that it gives away that my attention is elsewhere, but I'm definitely not listening to you. Your words are going in one ear and right out the other. I'll shoot you an e-mail for "clarification" later.
I hate this about myself and I've worked very hard to overcome it, but after thirty-seven years I've learned to accept that it's my baseline. I'll have to actively work against it for the rest of my life.
Unfortunately, this applies to meetings and lectures as well. In school and, later, university I had to go to class and teach myself the material each night.
> In a call you can't be ignored or left on read for 4 hours.
You also have no time to formulate a thoughtful answer to complex questions, though, which is one my issues. Calls are fine for some things, but 90% of calls could be an email because they contain discussion that needs more than 15 minutes of thinking. And a lot of the time, these calls need a summary email to even keep track of what was said!
I think the gap issue in async communication is a feature, not a bug.