Why is Dwarf Star level a thing?

[Lightbuster30]

Stuff like "small island" or "large planet" or "small planet" I can understand. But why is Dwarf Star level a thing? We don't use terms like "gas dwarf" (yes, that is a thing for those who don't know) or "proto planet" as tiers. It just sorta feels like a pointless tier to have. Can someone explain why this tier is necessary, and what makes it stand out from the sub-tiers I brought up that makes it needed as it's own tier?

 

[Antvasima]

I do not remember. It was likely created to split up some large tier, but at this point it seems like unnecessary work for no gain to get rid of it.

 

[Gilad_Hyperstar]

Speaking of which, why there isn't a "Low 5-A", or "Large Planet Level" (I know that name is already used for 5-A but that could be named as "Gas Giant Level" instead and set the baseline at destroying Saturn or something like that) for Planets like Neptune and Uranus? I mean, the two Ice Giants are clearly much different in their composition than Jupiter and Saturn, and they're also much smaller than both of them.

As for High 5-A, there are sub-stellar objects called "Brown Dwarfs", which are much more massive than regular gas giants, so they shouldn't be 5-A, but are much smaller than stars, since they can't fuse hydrogen to helium, so they can't be Tier 4. "High 5-A" is a good middle ground between Planets and Stars

 

[DarkGrath]

This is something I've been curious about myself. It doesn't seem like a very necessary tier.