Electron is fine. While you find it "offensive" when an app "fails to behave like proper, 'native' apps on whatever platform they operate", I find it offensive when those various platforms create the expectation that apps should behave differently on their platform (and people blindly follow that).
(maybe offensive is too strong word... but I think it is not a positive)
Can you imagine if the various browsers ... Firefox, Chrome, Safari, ... had the expectation that web pages would be custom tailored to behave differently in their browser? Even worse, what if they expected you to code them from scratch, poosibly in a different language, just so they could be optimal? Would that be a positive?
Or how about if different car makers thought that in all cars of their brand, the turn signal or gear shifter must be in a special position, just to differentiate the look and feel of the cars from that of other car makers? How would that be a positive for drivers?
To me, we are past the point where it should feel different to be on a different platform. I go back and forth between Windows and Mac all the time, and apps that behave identically (or nearly identically) on both are my favorites. Visual Studio Code, while far from perfect (but certainly better than the last editor I used, which was native), works identically on all of them and I like that.
The desire for things to "feel native to the platform" seems to be either 1) something that comes from the platform makers themselves, for marketing reasons, or 2) simple tribal thinking.
Electron isn't perfect (I wish it didn't require downloading an entire browser engine, but simply used the one that is already installed), but the more apps that use it, the better it will get. Browser engines themselves are getting really really good, which means that many of these electron apps can also run as a simple web page for those that don't want to install them.... and again, they work the same, which is a big plus.