This is more of a suggestion for blizzard that i thought would be a good idea and also put our timewarped badges to good use.
Since we can unlock different types of armor, what if there was a way to buy crates of gear that contained BoEs from previous expansions from timewarped vendors. TBC timewalking event would offer classic and TBC, WotLK would be from wrath and so on.
of course BoEs meaning its just the random world drops, like greens but can range to any epic drops from out in the world. If you really want to be generous, could add raid drop BoEs. Each crate can give 3 to 5, depending on price of the crates
i just think there would be a nice way to collect some of the pieces of gear that arent as easy to collect and also have some use for badges that i know some of us dont really have a use for right now (unless they finally add Shadowlands and BFA timewalking events)