Currently my work around is to paste the text in the notes and copy from there the plain text to paste it to for example the mail app.
How can I copy formatted text and paste it as plain text for example in the Mail app?
In Mail on iOS 12, I use the "Share > Copy" trick:
Still (too) many hoops to jump through but at least you don't need to switch between apps. The "Share > Copy" trick might not be available in other apps, though.