Bosses are fun to do as a group, but it's not always possible to group up for a boss. I find it kind of difficult as a newish player, but casual player who struggles to parry or dodge attacks every now and then against bosses. Not to mention when I spawn one and it's just me - it's unfortunate to get a multistar boss with reflection or such. At the point, I get one shot and any damage I do always hits me. Then we just have a boss roaming around the area.
I don't want to take away the difficulty of bosses, but maybe adjust them to be a bit more friendlier to casual players or solo's that are trying to progress?