There is a couple of things you can do to minimized the "segments" but the joining "seams" will always remain.
In boundary blend, you can control which points are jointed to the next section. If boundary blend decides without guidance, you may end up with lots of little segments. If You wish to manage them, use the options to specify specifically which end joins to which other end.
It is a bit of work and it seems somewhat burdensome in the UI, but the result may actually result in a better surface.
If nothing else, you become more aware of how you wish to distribute the surface from one section to the next.