Solo stakers are missing their slots mainly because they don't show up (=are offline) and are not reorged significantly more often than other (arguably bad) validators. Same applies to Rocketpool.
The actual surprise is Coinbase, though.

I assume most of the "proposed but reorged" = timing games for the sake of MEV/builders?

A doodler and computerer. I like permissive/permissionless open source, smart contracts, p2p systems, room-scale VR, and NixOS.

shazow.net

Currently: WhatsABI

Or epoch boundries, or bid aize blocks.
These are then the big 3, of "reasons of being reorged".