My fussy boy was swaddled until 6.5 months old, only way to let him sleep better.
It is not good for development. Babies grow when they stretch during sleep. Therefore, when baby is awake, give him lots of exercise time -- tummy time, roll over, stretch to get toys, etc.
My boy suddenly refused to be swaddled one day. After that, I notice his physical development became faster, e.g. wave, clap hands.