I really like the look of the Ploopy Classic. I use an Elecom Huge, and I love it. I grew up with a Logitech TrackMan Marble (the old school one, not the ambidextrous one) and I loved it. So the Elecom Huge is like a modern version of that old classic, and it’s great for office and daily use - not so much for gaming though.
Proton’s implementation isn’t like a time capsule, it’s meant for just scheduling emails to others, not yourself. Scheduled emails are available in their own folder, and can be edited or deleted.