my reasoning: you end up w/ a lot of filters very quickly and related post id will be just one of them also linking it to another resource usually involved ex

my reasoning: you end up w/ a lot of filters very quickly and related post id will be just one of them also linking it to another resource usually involved expecting defaults (default ordering, default display, pagination etc) if you stay "flat" this tends to be less of an issue when usecases become more complex