I recently asked here, a question about the choice of OpenType Unicode fonts for my PhD thesis. After considering the comments and answers to the question, I decided to use
Libertinus for both text and math.
However, one of the comments to my question keeps nagging my inner self. To paraphrase it, they cautioned me that I shall end up having to do some more manual kerning in math mode.
I do not possess an in-depth knowledge about typographic convention and best practices. Inspired by this question wherein that user had asked about when should they be using non-breaking space, in the same vein, I would like to seek best practice guidance on the following issue:
When (and why) do we need manual kerning for math content when using certain fonts?