Looking for opinions on this feat.  It was made with a one-armed fighter in mind.  Thanks!

You have endured intense physical training with a single arm, while at the expense of your other arm.  Choose your left or right hand to gain the following benefits:

• Melee weapons with the Two-Handed property, can be used with the chosen hand alone, instead of needing two hands to use; and have advantage on damage rolls.
• Melee weapons without the Thrown property, can be thrown (range 20/60) using the same ability modifier for the Attack roll and damage roll that you would use for a melee Attack with the weapon, if used with the chosen hand.
• Melee weapons with the Versatile property, can be used as if with two hands, when used with the chosen hand alone; and have advantage on attack rolls.
• You lack proficiency with weapons and shields, used with your non-chosen arm alone, even if you would normally have proficiency.

Way out of line, and worded very weirdly.  I would rework this as a boon specifically for that fighter, or with the prerequisite "Only one arm", as allowing the feat for someone with two functional arms makes no sense.  Eliminate the advantage conditions, take the thrown condition down to 10/30, and I'd honestly probably do disadvantage on two-handed attacks made with one hand.  Losing an arm is an enormous disadvantage for a combatant, a feat shouldn't erase every aspect of that disadvantage.  An einhander boon could make up some lost ground, but I'd limit it to making up some lost ground rather than making the one-handed fighter strictly better than a two-handed fighter.