You still use a warrior tank. Most “competitive” guilds are using IEA because of it being a huge dps upgrade. It’s a fairly standard thing in classic, somewhat odd you hadn’t heard about that yet. I’ve linked warcraft logs Speed Run rankings, filtered to hide guilds NOT using improved expose armor. Only 4 guilds in the top 50 don’t use it.
https://classic.warcraftlogs.com/zone/rankings/1005#metric=speed&search=abilities.11198