General question about this project in relation with main Magento2 project

[joggienl]

The general Magento2 GraphQL DevDocs describes several places where something is "PWA Studio Only".
Wondering, why can't this be part of the "default" Magento2 installation? Why have this separate?

A query like recaptchaV3Config is useful for all headless like projects.

Also, since Magento 2.4.5 (or maybe even 2.4.4) the products query gives deprecation warnings for multiple fields on a product. It says something like this:

"Contains fields that are common to all types of products."
interface ProductInterface {
    "...."
    some_custom_attribute: String @deprecated(reason: "Use the `custom_attributes` field instead.")
    "...."
}

This is visible in the main mageno2 instance. To be able to use custom_attributes you need to install the module from this project (I suppose).

It is a bit confusing, or I am missing documentation about this?

Thanks!