What does this mean exactly? "Bosses in dungeons represent unique challenges, as they often feature special mechanics that need to be managed by the whole group. "
It makes it sound like there is an artificial mechanism that requires a group. The same article, however, also says "It is even possible to solo a dungeon."
My question then, is is possible to enter these dungeons with two or three people rather than the required four and still be able to complete it with extra work?