Called it :
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Couldn't agree more.The difficulty in TBC was more down to the sensitivity of gameplay and requirements of players to play together as a group and being considerate of group synergy. The game wasn't especially hard but it was easy to fail, and if you failed the game punished you pretty hard. Tanking 5 mans in blues at the start of TBC was a hair-raising task that no further expansion has remotely come close to, due to the threat mechanic and dungeon design/mechanics (aka everything designed to CC the tank/drop threat). But that frustrating design made the well oiled machine of a good group feel ever more satisfying, DPS numbers came secondary to group synergy/situational planning/reaction.
Which is exactly the kind of WoW I like, I don't want to be bombarded with a never-ending job of menial progression like in Legion, I like a heavy front end and then maintainence mode. WOTLK had some amazing story, visuals, raids, cool items etc but it wasn't rich or well designed like TBC in this aspect (endgame progression/relevance) and content was churned through extremely quickly, a lot of overly easy content existed and it was a little more shallow (but still much improved in many areas and a great game).