Do you include accents in your dialogue?

When you write your characters dialogue, do you spell out the words the way your character is pronouncing them, or use other regional slang words to indicate a southern twang or to indicate a character is speaking ESOL? (English as a Second Language.) Have you ever written a deaf character who communicated through sign language? How did you write that out?

For me, I find phonetically-spelled dialogue to be very annoying and hard to read. I can see adding in accents as a good character addition, as long as you don't go overboard with it, or use it to other or mock a character. Like in the infamous modded thread on Kboards. It feels like this is a situation where an author can get themselves into trouble, if they aren't careful. Older books did it all the time. But that was also a much more openly racist time than now, so using older books as a style guide may not be the best decision.

So far, I haven't included accents at all. How my characters sound isn't something that typically occurs to me, but perhaps this is a mistake. What do y'all think?