There are two types of Gyeongsang-do dialects

This is from an omniscient Seoulite's perspective, lol
1. Vocabulary is Gyeongsang-do dialect (jeongguji, mundi, geumma, dandi-haera, kking-gajyeosseoyo, etc.)
2. The accent is Gyeongsang-do dialect
I've traveled a lot to Busan, Daegu, Ulsan, Changwon, etc.
When locals realize I'm from Seoul, they definitely don't use type 1. I even get the impression they don't use it at all.
However, it seems type 2 is unavoidable.
So, it sounds perfectly natural, and there are no issues with communication at all.
They don't really have to do this, but I think it's a subtle way Gyeongsang-do locals show consideration for guests from out of town.
Even though we can understand everything just fine, haha. People from Seoul know almost all the Gyeongsang-do words. More or less..
I definitely get the feeling that if they know you're from Seoul, they don't use type 1 much. This is just my personal opinion. It might just be my imagination.