This is not one of those "oh, that's annoying, i'll have to remember that and learn to work around it" issues. It's more like "I want to immediately stop using this software but have no choice". Its driving me crazy - Slack is all text input. Don't break text input dummy!
I’ve already put my money where my mouth is and sent an email saying I intend to cancel all future payments to Slack unless they give the option to disable it, I suggest everyone else does the same.
"I'm afraid there is no way to disable this at the moment, and it's not in the roadmap to roll back on this feature. That said, we're still in the initial stages here, so our focus right now is listening to feedback as we consider certain changes for improvement as we move forward. You've raised some fair points here, so I've shared your feedback with my team for consideration in the future."