You may to need to be more specific. If your client is self hosted, then the “they” you refer to, most likely has no control over what plugins are being used by your client.
Unless you’re referring to a printed policy specific to a particular hosting service, or referring to a free blog hosted on wordpress.com, I can’t recall ever encountering a similar issue (plugins they didn’t allow).
If you’re referring to a site on wordpress.com, be sure to brush up on the differences (wordpress.org vs wordpress.com) as part of your research.
In either case, your lead in and support title doesn’t appear congruous with the topic you are researching, and you seem to be mixing two completely separate issues; Not to mention, asking a question that just begs to be peppered with enormously subjective responses. (One mans garbage, etc, etc…)
Hope something there helps, good luck with the research!
Ha! Silly me… I completely overlooked the clues.
WP engine managed WordPress hosting, offering “Curated Plugins & Themes”
I would guess it might function much like wordpress.com, but I’ll leave the actual research to you. 🙂
