I know but it adds a lot to the story that we don't have a "perfect" hero.
I think the ''regret'' was because it made and still makes it harder for Kirkman to write. He has to always keep in mind to write scenes that are specific to Rick's handicap. Like '' Oh, Rick is gonna do an gesture with his hand, but oh wait, he cant. Because he doesnt have that hand. Whelps, i guess i have to rethink that moment. '' If he still had two hands, he wouldnt have to do that. I think he said that in some Letter Hacks, but i cannot remember which one.
So...yeah, comic-wise, it is because it is an hindrance at times.
In the show....well, if they could do it with an leg, i guess they can do it with an hand. Maybe. I dunno.
Kirkman's problems come from writing something like, "Rick buttons his shirt" and then realizes that he can't. However, it's all the little things that came out of Rick losing his hand that makes it so great. After the prison assault, Rick couldn't even open a can of beans. He had to ask Carl to do it for him. It was a simple moment, but it showed them leaning on each other. If Carl had died in the assault (and Rick didn't lose his will to live), he would've starved to death.
Plus, Rick losing his hand made the comic feel that much more "real." Even the main character wasn't safe. It's such an iconic moment.
With Game of Thrones, whenever a "big" episode is coming up, the readers know and set up hidden cameras and want to capture their friends reactions. I was looking forward to that with The Walking Dead. I wanted to see the reactions of my friends and family when Rick loses his hand or Lori and Judith get blown to smithereens. It's a little sad