I've been seeing a growing trend in the last few years with the use of unit fillers. I see more and more people using them, and for some reason, the concept confuses me a little. I get the why as an artistic flair, but I am not seeing the general utility or game value. What is the purpose of unit fillers other than artistic?
Do people use them to block line of sight? Is there a certain amount of figures they are meant to represent? How does removing them during play affect game? Is a 40x40mm unit filler represent 4 dudes on 20mm bases? Are their any general rules or assumptions that govern their use?
I can see the cost savings, using a larger unit size while not owning all the miniatures, but how is it determined as ok as there are no rules in the game to justify it.
Please help me to understand Unit Fillers. Why do you personally use them? How do you personally use them?