The Paperwhite is too small for PDFs, but great for fiction and portability. The Scribe is excellent for PDFs, but it makes my books disappear sometimes, and it does not work well with sideloaded fonts. The Forma is a middle ground in terms of portability, but its battery died after a couple years and nowadays I only use it near a power outlet.
I find it to be a good combination. Like you said, the paperwhite is amazing for laying in bed at night (really like the backlight) or on the couch or traveling to read. But it is too small for PDFs or serious notetaking. The Remarkable is perfect for those things. The remarkable also gives you full control over your files to do whatever you want. You can connect it to Google Drive, Dropbox, OneDrive, etc and/or just manage files directly on device (plug it in via usb-c and it shows up as a USB mass storage device).
The two tools compliment themselves nicely. Just my 2 cents.
She's also one of those folks who sideloads with Calibre as well as purchasing through Amazon.
I think the only thing that has been discontinued is the free 3G internet all over the world that they apparently figured was too expensive.
I wish it were less destructible! I upgraded to a Paperwhite (2021) when the Voyage's power button broke. Water resistance is nice, but having to get the "signature" edition for a light sensor and an easily scratched plastic display is quite disappointing.