What ho,
Let's assume you are level 100, and running level 1-90 content for whatever reasons.
80% of that time is arguably spent on running by foot to get from boss A to boss B. This is perhaps especially noticeable in the oldest examples, like the Molten Core, where you have to run across half the instance simply to get to Ragnaros at the end.
Do you think Blizzard should unlock the ability to use your ground mounts inside those instances, or would that take away what little challenge remains in running older content?