Re: "some design issues that prevents it becoming platform independent"
These days, a lot of the big GUI applications are based on Electron too. Sure, it's inefficient to start up a huge Chromium+JS+HTML environment just for a note taking app, but on a modern Linux desktop I'd take that any time if the alternative is not having the app at all.
I'm also a former Evernote user - the lack of a Linux client was a pain but I worked around it by just keeping Evernote open in a browser tab. What finally killed it for me was the incessant rolling out of glitzy new things like emoticons that I didn't need, along with the charging. I don't mind paying money for a good product where I use loads of the features, but with Evernote I was just taking text notes and having to bodge Linux access anyway. I could do all the same things on Google Keep for less money, so that's where I ended up.