[Natsu]

> there is no harm with later adding a glossary item

When are you adding this? If you do that when obtaining the patent, all is well and good.

If you do that in court, after saying otherwise, as has been done here, there's quite a lot of harm. People have a right to know what is and is not patent infringement, as they're on the hook for big money.

If you can just change what your patent does and does not cover, on a whim, when fishing for money in court, there's quite a lot of harm in that. Millions of dollars worth of harm. Nobody had any way of knowing what idiosyncratic definitions of words you were using and yet everybody else was responsible for not infringing upon your patent.