Hi,
So I switched from an iPad + pen to a reMarkable 1 some years ago and have never thought of going back. I use my remarkable on a daily basis for taking meeting notes, markup of design papers and other documents.
On my Mac's (MBP and MAc Pro desktop) I am able to send documents to my reMarkable via the RMAPI interface or the reMarkable app without any issues and if I have a document or web page that I want on my reMarkable I just print the item. The rmapi will allow you to create a printer that will permit you to print to your reMarkable.
I have read some reviews that indicate one of the better replacement pens for the rM2 is the Amazon Scribe Pen (pro version) works very good.