Simple query boolean expressions: allow checking without true/false

Normal expressions allow booleans to be evaluated without comparison, and the not operator, e.g.:

if(not myBool, "hello", "hi")

In simple query expressions however, we need to explicitly check against True or False, and the not operator is not allowed:

Entity.Attribute = False

I'd consider that bad coding style in a normal expression. Why can't we use "proper" boolean expressions in simple queries?