THe days when academics had time to read hundreds of applications are fast disappearing - both because of our teaching/admin workload and because of the expansion in HE numbers
Again, this is the peril of generalisations: of the the 3 (RG) universities I've worked at in the Humanities, all decisions about whether to invite to interview or make an offer were made by academic staff in the Arts faculties. And in my experience across the last 20 years, yes we do read the application forms.
It may be different at other places but I've always worked in faculties, schools & departments where it's been thought (rightly IMO) that it's really only those who are actually teaching the courses who are equipped to make the judgements about whom to admit into those courses.
But as another academic in the Sciences writes upthread, they do it differently.
I think I"ve said this before, but really in my experience, there aren't "secrets" that we as academic staff won't or don't tell applicants. My advice would be fore parents to discuss the questions posted upthread with your DCs, and also discuss with your DCs how your DCs as the actual intending applicants/students -- will ask the questions at Open Days, Applicant Visit Days, or interview days (the discipline/s I work in still interview at the top end). Rehearse with your DCs how they can ask questions which wil help them make good informed choices that meet their individual needs & desires, and write an excellent application that will help them towards their goals.
Sometimes, it's all too easy to get the impression that parents think you can 'game' the system. I would advise against that way of looking at it.