Um.. I'm not sure the article author is familiar with the fact that "Skype for business" (the "complex" one) is actually home grown and was just rebranded from Lync. This is not at all the same as the consumer Skype, which actually tries to be a weird mixup between Snapchat and whatnot at the moment (failing utterly of course). Skype for Business (+ PSTN calling) is actually pretty great on Office 365 tbh...
I work at a large corporation where we use Skype For Business and I swear, this is probably the worst piece of software I have ever used. They can't get basic things right - I can send a message to my coworker right now, and it will appear in the list of messages on his machine somewhere in between past messages. For a while, we had someone who couldn't receive any attachments, skype would just say "failed sending" -…
My favorite recent thing - I'll hang up a call and randomly SfB will spawn about a dozen call quality survey windows for every call I've recently completed.