It often has nothing to do with whether or not the listeners are understanding or patient. Some stutters (seems like OP is one) are often not able to say things with the tone they are feeling. Tone has a major impact on your message. Hello!! Hello? Hello. Hello… So, even if we “just talk” the listener can completely get the wrong message. “I’ve been trying to ask grandma about her childhood but bc it comes out so choppy, she thinks I’m not really interested and am just asking to be polite.” Even if you conjure up the physical energy to constantly assure people you are being sincere, you are talking the same way your message still seems insincere/confusing . Having family who are actual stutterers means they are aware of all these secondary problems