I haven't directly tried this myself, but I believe the answer is yes, you are correct.
To be fair, this is barely even a Craft question... This is 99% about Redactor, and what it is capable of. Skimming the Settings > Clean page of the Redactor docs, it seems like Redactor already takes steps to normalize content from MS Word, and
pastePlainText is simply one piece of the puzzle.
Here are some steps you can take to further assess whether you're getting the output you want from your Redactor settings...
- Look at how the data is being stored in your database. Specifically, keep an eye on your field's column in the
- Try various settings from the Redactor "Clean" options. The developers behind Redactor are clearly aware of MS Word, and all of it's bizarre behavior. If you don't get the results you want right away, try mixing & matching Redactor settings until you get the desired behavior.
Hope that helps!