That was what killed it for me. After they rewrote in Electron, using the app always felt sluggish, and despite the fact that it didn't actually interfere with any of my uses of it, I went from really liking their service to tolerating it as the lesser of several evils.
I'm not sure whether electron itself is bad, or if it's the fact that any company who would use it has made an executive decision to cut corners and sacrifice user happiness for development velocity (Microsoft/VS Code excepted, mostly). Any such company would put out a bad product no matter what. Electron might just be the common subpar solution that these types of companies all gravitate towards; without it, they'd probably still build bad apps, but in a million different frameworks instead of just one.
Electron is a great tool tbh, I'm not on the hate train, but let's not pretend like electron is some bastion of quality or performance. People's grievances are legitimate, and part of that reason is just how low the bar is to ship something with it. Great for tinkerers, but sours normal users.
I can remember a lot of applications just not being available on Linux or Mac and you just had to suck it up. An Electron app beats that. And it’s not like Java UI apps were so much sleeker.