I remember reading alone, hitting a stutter and just easily continuing on.  It was like a quick surprise, pause, and continued without a second thought probably because there was no pressure at all.   I speak a bit about realizing that there is likely a way to eventually feel like we are at home alone or outside alone talking with the wind, getting used to that in public, in a video I shared here recently.    I think the severity is impacted psychologically because I have seen and lived through things that show people's reality changes everything.  I was in a discord chat hearing someone consistently stutter until someone interrupted them, they spoke quickly fluently, then continued on with the subject and back to the same stuttering pattern.  Others we did a fun test on where the moment they stuttered a little more severely, we asked they record themselves and we will leave the chat to see if the stutter lingers or the moment we are gone, it goes and we agreed they would finish the sentence even with no one listening anymore.  The moment we left, they went fluent finishing the sentence non challantly.   Its just hard to argue there is no psychological impact.