My opinion; Hostiles need to be able to sprint in Hard and have increased aggro range with difficulty levels. My server is set up with this kind of deal and you notice the difference.
I agree that just mobs being able to move faster when they aggro and having a larger aggro range would make a big difference. The way it is now there is little risk because you can avoid aggroing large groups and you always have the option to just run away.
it only makes them take around one extra hit to kill them, and that's on hard mode.
And zombies with tools or weapons adds around an extra half a heart to a heart of damage to you.
If you do understand that, then you should understand how it makes the game harder.
It is more difficult to kill an armed mob than killing an unarmed mob.
The armed mobs can kill you with less hits now when compared to the unarmed mobs.
So tell me. Tell me how this did not make the game hard in anyway because it is obviously harder than before.