I agree with you on this. I've asked, as far back as 2012 (met with a reply of crickets), that the editor control be changed to something better. I don't know what they are using under the hood, but as a fellow software developer, I can recommend a few that are on par with MS Word or any other good enough editor out there.
Dear Evernote, I'm compelled to write a complaint here about the unrelenting marketing for "Spaces" and upgrading to "Premuim". I am and have been a "Plus" subscriber for a few years now, and have no plans on upgrading to Premium or use Spaces. Please make it possible to suppress the constant pop-ups, reminders, and emails asking me to do so. It's getting REALLY annoying to the point where I am thinking of cancelling and no longer promoting Evernote to others. Thank you