Songs should exist within a project that has an overall meaning. I’ve stressed this multiple times in my blog as it connects songs similar to puzzle pieces in the way that we perceive life and understand situations.
Gabbin About has a great comparison of songs in albums being related to families as they would share similarities and traditions.
The experience is personally better through songs that are connected. Producing songs that are thrown in like papers in my chaotic backpack, shy away from the method of everything belonging together.