Going Blind - Post 40 yr old Reading Experience on Kindle = :( Is Onyx Nova 3 Kindle Compatible?

I'm considering purchasing an Onyx Nova 3 to supplement my steadily decreasing visual acuity with screen real estate. The additional features are a boon (potentially) but as my wife and I have a ton of books in Kindle (and of course loads I've sideloaded for us but those aren't the issue) and our reading habits overlap I don't want to leave the Kindle ecosystem entirely. I still want to be able to read a book she purchased without the rigmarole of sideloading it and vice versa. But the font size required for me to enjoy reading has come to the point that it would appear to an outside I am playing games on my device while my wife is the one actually being productive.

I've read lots of similar posts but don't feel this question has been answered to my satisfaction if you are ready to move on due to duplication of posts. Can the Kindle app run on this device and does it offer a reading experience similar to just reading on a Paperwhite? Are there any issues doing so that would potentially become major annoyances? As an aside does the device feel as durable as a Paperwhite? I hate to give up the waterproofing but TBH my Kindle has not suffered from intended exposure to water (while my wife's has made it through an entire washing cycle!). However I can be a bit rough on devices so something considerably more fragile would not be a good move for me. This is but one reason why I've eschewed the Oasis however given the issues with the 6 inch display if the Oasis is the better move by all means please state your opinion and if possible provide supporting arguments.

Thank you for taking the time to both read this and respond, my eyes and my fingers especially will eventually join in that chorus if I can alleviate their strain. My wife no doubt will appreciate a reduction in the distraction of near constant movement to change pages in her peripheral vision as well.

rna_errors = DNA's way of saying "Getting old sucks"