Not for every case, but there is a lot of factors involved, the big ones being: are you resistant to the idea of therapy (some adults have been through so much in terms of therapy that they have zero faith in it)? Is your SLP using a method that is adequate to your needs and your current abilities? Are they pushing you too hard without building skills from the base (as in throwing you into situations that only make you stutter more and therefore add more anxiety and self-doubt to the mix)? Are they working with the anxiety part too (they have to address your avoidance behaviours at this point. Short sentences and such make other people think you don’t want to talk to them, and that’s why they stay away. It’s not the stutter!) or are they just teaching you breathing exercises and shaping your fluency without taking into consideration how you will transfer those skills to the real world? Look into the Superfluency method by Barry Guitar and the Camperdown method by Onslow. If you think they might work for you, by all means ask the SLP if they are proficient in either of those (you’re shopping around and you’re paying for it... make it worth it!). And if you think you have a lot of baggage because of the stutter (as in cPTSD, depression, extreme anxiety) you might want to see a counsellor that will address those and not the stutter.