You can live without them. Far too many artists never gave a fuck or chose to include everything worthy on the actual album. Like I say, not the end of the world and hardly a sign of severe songwriting ineptitude. Unless it’s some god-awful remix, in which case it’s just laziness and poor taste.
However, I have an utmost respect for an artist who can record a terrific B-side and then leave it at that. Of course, on occasion it simply goes to show that the artist in question has no control over quality and can’t tell good from bad, but that is hardly the case with songs like Nick Cave’s “Little Empty Boat”, Pulp’s “Ansaphone” or, say, Luke Haines’ “Car Crash”.
Oh the number of fuckers who would kill for coming close to this brilliance: