That is true, I usually use comments when the text length is small, but I haven't found a practical way to read really long texts in the comment box. It would also make me have a lot of redundant info if I have to put the same text in the comment tag of every song in an album for quick retrieval. But I get your POV, it's not really a fundamental feature. I figured I'd ask since the code for pdf files is already there and would only need some little refactoring.
I have... I have! well not in the comments box per-se.. but can read it nevertheless.
You have to hover over certain areas and a huge tooltip containing the entire comment will appear (I have some long long comments and it works mostly great)
for Example, if you have comments in Track Information.. hover over that one line of comment and a tool tip will appear. Same with comment columns in the playlist in compact mode.
It works almost perfect the one problem is if the comment tooltip is so big that it touches the bottom of the screen it will disappear immediately.