This, right here, is probably the core of the disagreement. Imaro says that multiple classes having the same power doesn't make the game samey. So, presumably, the fact that every 5e class heals the same (cure wounds spell) or attacks the same doesn't make the game samey. These things ARE the same, so, they get removed from the equation.
To me, this just speaks to perception. The difference between 4e and 5e, is that 4e would actually try to differentiate these effects, somewhat and to varying degrees. So, sure, you get a Howl Warlock power as a 9th level encounter that looks a lot like a 1st level wizard at will Thunderwave. And, again, with thousands of powers spread over 40 classes, there's going to be overlap. That's unavoidable.
So, presumably, had 4e simply had a pool of powers shared across classes with a handful of class specific powers, then @Imaro would no longer find it samey.
Which, to me, rolls it right back around to presentation. You could argue, I think, that 5e is more efficient in its presentation because it doesn't reprint similar or same powers across different classes. You don't have a different Cure Wounds spell for each class. You have one Cure Wounds spell that works the same for all classes. You don't have a grab+attack power for a bunch of different classes, you have one grab+attack power that works identically for all classes that have extra attack.
What is it called when you go looking to find something extreme like being a nazi or an anti-feminist or accusing them of calling someone brain damaged?
If they had actually been the same, they would have been less samey!![]()

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.