The actual reason this is even an issue is because people cannot accept failure as part of the fun of playing a game.
If it applied to many different abilities instead of just one of five options for a few fighter-types, you'd be right.
But "people" can accept failure as part of the fun of playing a game just fine, with the ability as it stands in the game.
This is, of course, the identical argument one can apply to any spell spellcasters can cast which does damage on a miss. It is one of the arguments that applies exactly equally to all those spells, and alchemical weapons. And yet, for decades you've never had a complaint about those other spells and types of weapons.
While I think one can argue the difference between spells/splash weapons and these melee weapons with this ability, "don't know how to have fun without failure" is not one of those differences.
I've challenged you before to explain why your argument doesn't apply to, for example, lightning bolt, and you never answer the question directly. Then you wait a week or so, and make the same argument again.
So answer the challenge already. If your argument is sound, why doesn't it apply to half-damage spells, and why didn't you complain all these years about them if it's about people not being able to have fun despite failure?
If a game is only fun when there is success to a greater or lesser degree then we have the issue of good old fashioned poor sportsmanship that no one seems to be willing to look in the eye.
Oh I see now - people who have fun with things which you don't like are now poor sportsmen - unless it's a spell or an alchemical weapon, in which case...crickets.