Yes, I'm using it to write a novella - it's great for long form writing! <3 It's been a lovely experience - completely distraction-free, the tactile feel of the reMarkable pencil on the tablet truly feels like pencil on paper - its such a luxurious experience!
I got it after being in a years-long writing slump. I hated writing for "fun" on a computer after being on a computer all day at work, so drafting felt like work and had stopped being fun... After the reMarkable though, writing is so much fun again!!!
I promise I don't work for reMarkable LOL I just really love mine - I think you will too!
I think that your wife should go with the iPad. If she's "not convinced" by reMarkable's selling points, then she's right - it would be easier to stick with what she's knows.
Because yes, the biggest selling point of the reMarkable is that it's a distraction-free device that truly feels like writing on paper - the experience of writing on one is just blissful.
But she's not looking for a device to bring her joy while writing - she's using it for work. As much as I love the reMarkable, it sounds like your wife would be happier with an iPad.
The folks I see in this subreddit that are most disappointed with the reMarkable are folks who expected it to do a bunch of things, like an iPad does. But the reMarkable's strength is that it does one thing really well: provides a high-class, luxurious writing experience, for people who love the tactile feeling of putting pencil to paper.
If she's just using it for work, sounds like an iPad would be best.