Even when people can read at a very high level, they usually prefer to read material at a somewhat easier level. If you make your writing easy and clear, your audience is much more likely to read it and remember it. You may need to include background information or define terms for readers unfamiliar with your topic. If what you have to say is vitally interesting to your audience, they are more likely to be willing to work a little at understanding you. However, we rarely have a captive outside outside of school settings.
Professionals are busy and have many calls on their attention.
If you want a piece of their time, you have to make your message clear and intersting. You may have to start by telling them exactly why your message should be interesting to them - don't assume that they will figure it out. I once had a boss who announced a department meeting - on the third page of a memo describing some changes in department procedures that didn't affect many people. Here's where we get misunderstandings because of cultural and other differences. For example, in a writing contest for high school students in an urban area, participants were shown a picture of a farmer shearing sheep.