An anon gave me notepad recs and I did find Notepad by Panagola Private Limited, and it is the simplicity I seek and able to take or export .txt files, and there's also Standard Notes which adds end-to-end encryption when you want to share or backup notes, and Write Now by Aerodroid.
All lack ads cancer, all are up to date on the Play Store.
Manny thanks.
I've been using Notepad by Braden Farmer, but this guy looks like he won't be maintaining his work anymore and I had to install it via APKPure. It is another ad-free and minimal notepad that can import/export .txt files.

I leave this here for anyone who searching for info later.