I see what ur saying but think about it like this. Near the end of the movie another character has the choice of keeping the “confident” version of that character or revert them back to their stuttering “less confident” version. they choose to revert them back because they love them the way they are. Just like people who actually care about you don’t care about your stuttering. Also when said character was in their not stuttering “confident” state they were making selfish/bad decisions. Then when they were reverted back to their “less confident/stuttering” state they were still able to do overcome and save the day. Also if i’m not mistaken the character stuttered less near the end or at least was confident despite it. I also believe that stuttering is Gods way of nerfing us cuz i feel like if i did not stutter i would be cocky, arrogant, and would talk way too much and get myself into bad situations. Instead I am way more humble (not weak) and by speaking less I have learned way more about people, patterns, information that i can use to my advantage. I know it can be very hard but perspective is everything.