HAs are for those who want to take their game further

They require some desire of urgency and quickly sorting things between you and AIs.
It's by far the most useful rush for getting better, you can practise..
* settling only needed cities early that will contribute towards your rush
* war tactics like metal pillaging, fork attacks, luring units out of cities, and overall just being brave without using siege
* learning to accept losses in favor of quick city capturing progress
* economy recovery, combined with worker management and fully understanding upkeep costs
HAs work well up to deity, while chariot or Axe rushes are often not an option here (Axes sometimes are, but i am usually alone with that

).
If you wait for cats, AIs can have longbows already at that level.
But if you get good with HAs, you can go a very long way difficulty wise.