We must be playing a different FFXIV then.
While we all understand the point you're making, you're also guilty of changing out the word "piece" with "type" to make your argument work.

The XIV dev team is great at giving us new pieces of content to play with. Case in point, there is no logical argument to be made that Weeping City is the same as Void Ark. Each plays completely differently, all the way down to the emphasis on party mechanics in Weeping City.

But yes, both are 24-man raids, and they share the same trash/boss structure. So they are the same content types. And so far, the XIV dev team has not been great at giving us new types of content to play with.

Doesn't really change what either of you are arguing, but really there is no need to blur the lines.