Earlier quoted context omitted.
Technical people who haven't used IRC can barely figure out IRC their first time using it. Trying to sell IRC to a company would be hilarious. Bob in Accounting getting on IRC and feeling comfortable with it's UX?
Then you've never seen the 'hilariously' bad UX they already put up with, with things like Quickbooks. mIRC is pretty straight forward compared to that.
The reason is that when you sit there clicking through a bunch of menus to find something in QuickBooks (or a typical atrocious enterprise app), nobody sees you; and if you screw something up there, you spend some more time fixing it and nobody sees the screwup. Frustrating maybe, as you waste time, but almost everyone has some frustrating wastes of time at work.
If you're on IRC and people are talking at you and you sit there fumbling to figure out how to respond, it's like you're in a conversation and tongue-tied and everyone's looking at you. And if you screw something up, like send a message to the wrong channel... now you've done it in front of all your coworkers, in real time. Humans hate looking stupid in front of the group.
And if you screw something up on IRC in front of your coworkers, and you're someone with even a little anxiety about not being tech-savvy... that's going to flare right up.
Also, because now you're embarrassed, you're going to want something to blame. So you blame the tool.