I've also been playin on hard mode almost since the beginning. While it usually does make the game more interesting, it also annoyingly often makes your win depend on pure luck. Ironically this happens more often when your first guesses were very good.
Imagine having SHA?E confirmed and now being forced to stupidly guess between SHAPE, SHAKE, SHARE, SHAME, SHAVE or SHADE instead of eliminating half of those possibilities with a single word.
So maybe this implementation of a hard mode isn't well suited anyway if you're looking for a bigger challenge in skill.
I found that only happens if you try to hit the most common letters in your first guesses. If you use middle of the road letters you tend to get only a couple while eliminating a lot - s and e would be bad early letters because they don’t reduce enough words
Imagine having SHA?E confirmed and now being forced to stupidly guess between SHAPE, SHAKE, SHARE, SHAME, SHAVE or SHADE instead of eliminating half of those possibilities with a single word.
So maybe this implementation of a hard mode isn't well suited anyway if you're looking for a bigger challenge in skill.