So much for people saying "machines now are good enough for most basic uses and don't need upgrading anymore"... I guess Intel should be thankful for The Rise Of Electron Apps.
And modern software that behaves respectfully, I'd expect, especially if it's doing something that my 100Mhz Pentium w/ 64MB (with an M) of memory used to manage just fine (graphical email client). With the bonus that newer machines can run more such programs at once, and enjoy longer battery life.
I'm not sure what your point is. Nylas looks pretty cool, but is it doing so much more than other 10 year old email clients? Is it features or implementation choices that lead to relatively high resource usage?