The field you're griping doesn't exist does in fact exist and exists as watchdog journalism and media studies:

<https://en.wikipedia.org/wiki/Watchdog_Journalism>

Organisations and institutions include:

- On the Media, WNYC Studios -- center-left: <https://onthemedia.org>

- Poynter Institute <https://www.poynter.org/>

- Columbia Journalism Review <https://www.cjr.org/>

- FAIR (Fairness and Accuracy in Reporting) -- left/progressive: <https://fair.org/>

- Center for Media and Democracy -- conservative: <https://www.exposedbycmd.org/>

Amongst many others.

You'll also find journalism beats at various outlets, though those tend to focus more strongly on business side (often dismal for old-school print).