We've been using Skype for internal communication for a very long time. Back then it was the only option that worked on all the OSes we need (Linux, Windows, Mac), had all the features, and it just worked.
But the Electron app is just damn terrible. The message layout is super inefficient - it can display maybe half the messages compared to the native client. If you click somewhere, it un-expectecly moves you somewhere else. And it just stopped delivering new messages some time ago (I've tried to downgrade to 5.2, but that made no difference).
Interestingly enough, the web skype delivers messages just fine (it still sucks for all the other reasons).
And it also does not drain the battery that much. The devs apparently had the bright idea to render the messages window as canvas, and refresh it at 60hz no matter what. Because of emoticons. The web skype does that too, but if the tab is inactive Firefox suspends that.
The only thing that mostly works for me is the Android client. I wonder how they'll break that one.
In any case, we have lost all hope Skype will get better again. Also, there are other options nowadays.