I’ve been using the Skype web preview on my 2012 Retina MBP because Skype.app has become unusable on it. They must have recently switched video codecs or broken hardware acceleration, a video conference with 4-6 people chews up anywhere from 200%-400% of my Ivy Bridge i7. The same sized video conference using the Skype web preview in Chrome uses ~40%.
Of course the market dropped skype ever since Microsoft took over. </snark>
Seriously, I've been a remote worker for 8 years. Skype quality went down so much when MS took over. For the past 3 years, Slack and Zoom have literally picked up the slack.