So... potentially unpopular opinion...
I think you should definitely leave a note. The issue we think about is typically leaving a message behind for our loved ones. Yes, that is one very important aspect of it. Also worth considering, though, is that if you don't leave a note, there will need to be other irrefutable evidence of your suicide. Otherwise, your loved ones may be persons of interest in a suspicious death. Maybe they poisoned you with SN, or put the bag over your head, or strangled you. A signed note helps to avoid any possible suspicion. I wouldn't want the police looking into my husband for murder. Even if they ultimately decide that it's definitely suicide, the stress of my passing would be challenging enough without police interviews and the air of suspicion.