Well, he had very good reasons for choosing to have Luz be sent to Reality Summer Camp. Luz brought it upon herself. It wasn't his fault.

Principal Hal only made a non-speaking cameo appearance in the background at the Gravesfield Halloween Festival in "Thanks to Them". He was briefly seen doing finger guns to a woman who dressed up as a clown for Halloween.

He served his role

There was nothing more i needed or wanted to see from him

His only role was having Luz Noceda be sent to Reality Summer Camp and you don't think he could've gotten an emotional moment to share with Luz Noceda in "Thanks to Them", which was the only other episode he was featured in?

Nope

Not needed

A question I have for you: Why do you think every single minor or side character needs more screentime or prominence in the show? This isn’t a criticism, but just a genuine question.

I guess that's probably just how I feel.

Ok

I just like thinking big or whatever, but yeah, not every single character needs more screentime or prominence. Not every single character is important. Principal Hal had no purpose beyond sending Luz Noceda to Reality Summer Camp. His next and latest official episode appearance was in "Thanks to Them", which was only a non-speaking cameo appearance in the background at the Gravesfield Halloween Festival. Do you think Principal Hal was only brought back in that episode for nostalgia or something?

I think they just did that because they were lazy coming up with new background characters

Yeah! It's understandable that Principal Hal lives in Gravesfield, but it has nothing to do with the school.