It has nothing to do with skill You can take every game and make it hard just by making the enemies instakill you It's cheap,really
Hero Mode isn't insta-kill or cheap. You need a lot more hearts/blue tunic. You could've had more hearts when you got to Lorule, you could have had fairies with you - They shouldn't dumb down the damage just because you lacked resources to deal with it.
Remember when people complained about getting killed in 2 hits in Dark Souls? This thread sounds exactly like that. If you're getting hit in general, you're obviously not skilled enough for Hero mode and need some improvement. Learn to keep a minimum range from enemies, use spin attacks instead of getting up close and attacking, and make full use of ranged items. Avoid getting hit and Hero mode is easy, that's what I did.
Honestly, because of Hero mode, I feel that 3-heart runs in this game on Normal will be super easy due to the fact that I got better at completely avoiding taking damage. Hero mode breeds better players, because you can no longer afford to play the game recklessly like a complete idiot taking avoidable damage.