So physicists don't use terms among each other that laypeople don't know? They actually do, right? And yet, they're NOT using a forest of words that most would find impenetrable?
If you're a physicist who writes academic publications, are you claiming that a layperson would have no trouble readily understanding all the terminology?
While "discourse" isn't a "trigger word" to most publishing scholars in the humanities (and probably in the social sciences), it may be to you as a physicist, and also to some laypeople when faced with writing written by humanities scholars for other humanities scholars.
If you're going to complain about a word like discourse, I'm not surprised you have trouble reading scholarship that uses such words.
Goodness, maybe such writers are also using other shorthand terms for other concepts in their fields, and referring to things in other shorthand ways that they all tend to know, but that outsiders don't necessarily know. How dare they!