I'm in the same situation, my handwriting is illegibly bad, even by myself - the main reason I don't want to improve it is that I just don't use it, haven't for years, it'd be an incredible waste of time and effort. There's no motivating reason to do it except for perhaps some very abstract learning benefit - which hasn't to my knowledge even been proven out in the software engineering or computer science field, where it arguably makes the least sense.