For a better PDF experience, you might want to try 'koreader'. The native PDF support on my Kobo Forma was so bad I was ready to return it, before finding this. It's an open source PDF/epub reader that you can install on Remarkable and other eInk readers. It's just an app - it doesn't replace or degrade any existing functionality.
The Onyx Boox 3 max is great for that. the main function I use (articles and books) is the split screen with notes in one side and book/article in the other. The main downside is the price (~$800). It is also bulkier than other options.
This is a relief to hear! The only downside with the RM1/2 for me is the lackluster epub/PDF functionality, but if it is possible to put koreader on it without interference with existing functionality, I might just sell my Kobo e-reader and use the RM2 for all my reading and writing needs!
I pre-ordered the RM2 a couple a months ago and just got an email notifying me about a slight COVID-related delay. I don't really mind, I am confident that the company can deliver without to much fuzz.
https://github.com/koreader/koreader