The selling point of Electron is that it is cross platform, but that does come at a cost. The cost is essentially running a separate instance of Chrome for every application you run that is built with it. The runtime overhead for that is significant. It is a tradeoff that works for some applications, but there are a huge number of applications for which it makes them resource-sucking pigs that do not provide value significant enough to justify the resources they consume.
The source of most of complaining about Electron and companies/developers choosing to use it is that it's not just an ordinary trade-off. The gains - being cross-platform - accrue mostly to the producer side (cheaper to develop and maintain). The costs - resource use at runtime - happens entirely on the consumer side.
In other words, it's a typical case of costs being externalized, making the supposed trade-off be a "free win" instead. Since software resists commoditization, consumers don't even have a way to pass those costs back onto the vendor (by e.g. leaving for a competitor).
