Yeah, that is why it doesn't make sense to me. Evernote can never compete with the formatting options of other applications and Evernote's focus has always been on content (you know, your NOTES), not fancily presenting the content.
All the attempts to keep text plain (by carefully pasting and regularly removing formatting) do not work well (and are tedious) because formatting seems to be handled differently on various platforms (ios, mac, windows). And then the moment you paste content in ios, things go really bad.
There's probably more ways to do this, but the only way I see is for each note to have a plain text setting. So a note can be "set" to plain text. Then, from any device, pasting content into that note will always only paste the text.