Read above! And as I said, it's still in beta so PC has not yet recieved a complete patch that is finished.
Thus the point about making backups and turning off the beta if it ends up not working.
Plus, the example you provided me is someone using mods... Which commonly do not work well with updates.
But whatever, if the thought of copying a save into a different folder for five minutes horrifies you, I am not forcing you to do it.
The fact still remains that PC players have had access to horse combat for longer than Xbox players. They just have a choice whether to use the update or not.