I wonder in what situation exactly would a company legitimately have a need to interview a candidate for a total of 5 rounds? Wouldn't they run out of questions

I wonder in what situation exactly would a company legitimately have a need to interview a candidate for a total of 5 rounds? Wouldn't they run out of questions to ask? Are you applying for a CEO position? All it does is displaying for everyone to see their indecisiveness and wasting other people's time. They obviously couldn't make up their mind even after the first four rounds and that's just bad in any businesses. If I ever had to go through a five-rounds interview and they ended up turning me down, I will not care if it burns bridges as I will track down their boss and he/she will receive some nice hand-written letters from me to let them know how their company performed. A working relationship always goes both way and they obviously have not valued much of your time.