Why does Terraform not provide if-statements

Is there a deeper reason, why Terraform is not providing an if-statement to declare resources like this

resource "aws_ssm_parameter" "foo" {
  if = var.create_foo  # this is not available

  name  = "foo"
  type  = "String"
  value = "bar"
}

To me this feels like a very common use-case.

I know that one can write

resource "aws_ssm_parameter" "foo" {
  count = var.create_foo ? 1 : 0

  name  = "foo"
  type  = "String"
  value = "bar"
}

but this feels more like a workaround. This is also not the end of the story. In addition to this less readable count-construct, one also needs to refer to the first parameter everywhere else using aws_ssm_parameter.foo[0] everywhere.

So my question is: Why does Terraform not implement such a keyword? Is there a reason this does not fit into the design? Is it just technically complicated to implement and might come some time soon?

I am honestly thinking about writing some kind of terraform-pre-processor which would automatically replace all if-statements by the corresponding count statement as well as all references to this resource with an added [0] (or something slightly more robust). Any reasons that might not be a good idea?