why are entity ids limited to [0..1500]?

[jdoran]

Is this a client limitation?

EntityList::GetFreeID() restricts entity ids in this range. Image made a reference to this in 2012, so this is known. I'm just curious, as the value
seems small.

[KLS]

I don't know exactly where the client limit is but there's a client limit somewhere around there.

Frankly though, that's a lot of entities.