IRC is an information black hole where data that crosses the event horizon (scrolls off screen) will never return.
Sure, you can write your own logs, but does your business want you creating even more information to have to submit as evidence if you’re sued? What a nightmare.
I worked for a company who interviewed someone who turned out to be a habitual scammer.
He somehow managed to know enough technical information to get past a phone screen, and in the in-person interview claimed to be the second coming of Christ. When he didn't get hired, he sued for religious discrimination.
Fortunately, all communications with and about him were entirely professional and didn't include a reference to his claim, so (iirc) the case was tossed in short order.
That being said, you don't need to do anything to get sued- you just need to have something worth suing for.
Sure, you can write your own logs, but does your business want you creating even more information to have to submit as evidence if you’re sued? What a nightmare.