I feel like it wouldn't be such a large issue if people didn't expect tanks to always mass pull.

I tend to only pull one pack at a time if I'm not familiar with a dungeon or if the healer or dps look a little under geared. So my dungeon takes like 5 minutes longer? Big whoop.

If a tank is getting 1 shot or a healer is running oom, sure there's an issue. But we're talking about slower clear speeds right? We're not talking about a wipe fest?