The principle of charity is useful for reconstructing what was really meant, unlike LCPW

Agreed that LCPW is not directly useful this way. On the other hand, if what you want is correct understanding of a question, it doesn't matter what anyone really thought originally, only what is the answer; or for arguments, not what were the original arguments, but what are the actually important considerations. There is a failure mode in disagreements where opponents start arguing about what they really meant, finding ground for the verbal fight unrelated to the original topic, preventing useful progress.

If taken as a counter-bias against tendency to assume a less reasonable position than should be expected, principle of charity can somewhat help, but then there are better third alternatives to this technique that don't share its glaring anti-epistemic flaws. For example, you search harder for possible reasonable interpretations, to make sure they are available for consideration, but retain expected bad interpretations in the distribution of possible intended meanings.