Being awful is Skype's killer feature. You can't carpet-bomb with pings, you can't comfortably copy and paste code or logs into it, half of devs who use linux don't bother running it on a VM and instead use flaky third-party clients, it eats messages randomly, so long story short - people generally avoid it except for trivial shit. And on the odd day when they don't, I get a copy on Outlook anyway.
I've read some horror stories about Slack, and I shudder to think what would happen if my company moved to it.
Fortunately, engineers have invented a way to attach a Strolling Wheelbarrow After Plane, where you can stash the sleeping passengers without ejecting them out of the plane entirely. This has the unpleasant side effect of slowing down the journey for everyone when passengers wake up inorderly (and God forbid everyone wake up at the same time), though.
I've read some horror stories about Slack, and I shudder to think what would happen if my company moved to it.