I am currently in graduate school. I use adobe acrobat pro DC all the time to convert my classes powerpoints into pdfs. Once they are formatted as a pdf, I can take notes on them, and it sticks.
I just realized I have been doing it wrong. I have been using the Add Text option, an option within the fill & sign tool. While this has been most effective in taking notes on powerpoints and helping me study, there have been many issues with it.
The fill & sign tool is not made for quick note taking and texts. Adobe Acrobat DC should create an Add Text Tool that is separate from the one found within the fill & sign. An add text tool that can allow you to jot notes down on a document with ease and efficiency. That would resolve my issues of my text just freezing, then "disappearing", and to only end up in another part of the document I am working on. And, I think many people could benefit from this tool.