The performance complaints are mostly from developers. Users of your application, if it is important to them, will not care.
The big thing about Electron which most developer discussions miss is that it enables low-cost multi-platform development, especially if you already have a web app. In this age when people would like to pay as close to 0 as possible for software, this is important. I have a SaaS app and people keep asking me about apps for iOS, Android and native Mac/Windows. There is no way I could afford to develop+maintain for even one of those platforms. Of course most people who ask about this would like to get the additional platforms for free :-)
Electron makes it possible for me to re-package my app as a native one, with certain benefits (easier file uploads, access to printers and peripherals, etc), and with a reasonable cost.
Less advanced users complain when their computer is slow. Developers know how to locate the problem and that it could be fixed.
Everyone here knows that Electron is the cheapest way to wrap a web app. It's obviously the fastest way for someone with web but not desktop experience to create a minimum viable desktop app. It isn't the only option for low-cost multi-platform development.
You have good reasons for producing a hybrid app instead of a native app. It's questionable whether Slack does.
The big thing about Electron which most developer discussions miss is that it enables low-cost multi-platform development, especially if you already have a web app. In this age when people would like to pay as close to 0 as possible for software, this is important. I have a SaaS app and people keep asking me about apps for iOS, Android and native Mac/Windows. There is no way I could afford to develop+maintain for even one of those platforms. Of course most people who ask about this would like to get the additional platforms for free :-)
Electron makes it possible for me to re-package my app as a native one, with certain benefits (easier file uploads, access to printers and peripherals, etc), and with a reasonable cost.