Not sure it was quite flawless, but it has gone from being my first-choice platform to last place. I fear that LinkedIn is going down a similar path, post-acquisition.
Yeah no. Skype was certainly good at the time, but compared to discord, slack, hangouts, or pretty much any contemporary chat app/suite, it didn't stand up.
Also as another user mentioned, skype was a DOS vector for individual users.
A number of Internet personalities such as Twitch streamers were doxxed with a little help from Skype IPs. Maybe impossible to avoid without centralized hubs or an overlay network like Tor.
It is curious how Skype was started by Kazaa engineers basically to find a legit use for their p2p streaming tech, and now it's not even p2p anymore.