Paper authors are not: they want to look sophisticated, whether their findings are sophisticated or not.
Paper reviewers are not: they want to preserve the usual style, at least for consistency, and also because they are authors of other papers, too.
Readers who are specialists in the field? Maybe, but they are used to the jargon and easily see through it.
Readers outside the field? Maybe, but nobody has an incentive to care about them, they are not reviewers, not potential co-authors (unless you plan a rare cross-disciplinary study), and if they approve grants, it may be better to impress them with the jargon and look important.
The rare curious non-scientist reader? These are a rounding error.