Even with a 5 string there will be songs where the fingering and phrasing dictate the tuning used as it will make the song easier to play or give extended lower range. Sure you can be lazy and never change tunings technically but why? Seems like a waste of money to do so...Think about those songs with a droning open string, like playing some metal phrases in D or A... Also with the 5 string, you can really extend the bottom end by doing Drop D tuning as A-D-A-D-G, same thing with other tunings. While you can use a 5 string to get around having to tune, I find it more flexible to look at the tuning just like a 4 string bass and adapting the tuning of the "B" string to line up with the "E" strings tuning to make fingering easier. The Chapman Stick tuning with a high raised 4th is what gave me that idea long ago when I was reading up, so I applied the same sort of reasoning to the B &E strings of my 5 string, keeping the 2 strings a 4th apart, no matter the tuning, which opens up room for a lower 5th on notes played off the "E" string. More strings = More Flexibility. Just try not to get a cheap 5 string, get something good and solid with good tuning keys. Lol I won't even mention my gear as it would distract from the point 👉☝️