This is the argument/justification that needs to die. Legacy content should never be getting buffed, because it’s irrelevant to max level progression. It should be staying exactly the same and only getting easier as level increases. Never harder.
Also, getting to level 80 isn’t even going to make it easier. Players with beta access have already reported that reaching 80 and getting geared only gets us to where we already were at 70 in 10.2.7. Blizz just resets the clock on our characters every prepatch and folks like you handwave it away like ‘the new level cap will fix it!’
EDIT: Refer to this post for historical context: