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That's why I'm developing eul, a lightweight native desktop client for Slack, Skype, Facebook etc: https://eul.im It's only 4 MB and handles tens of thousands of Slack messages in one chat without lag. 1.0 release is going to be out in early November.
One thing that concerns me about any 3rd party chat application is that it's difficult to know if my data is secure. Any thoughts on open sourcing your application?
I'm setting up a company right now to increase trustworthiness. Like the home page says, no data will ever be shared with anyone and soon it will be possible to verify this.