The log table is mainly used to track details of what has been done, and be able to browse (or search) it. It can also be used to generate statistics (if enable). So, no problem to delete things in it !
Moreover deleting "abusive" information isn't a problem but better cleaning unwanted things.
I think, seeing people facing this problem, and knowing problems generated (big logs, big backups, too much time and disk needed...), that it's worth doing things to have it resolved (soon).