> It probably doesn't help much but it can't hurt ... There's no benefit to leaking this information and it's potentially useful to an attacker even if only marginally so why risk it?

Actually, it can hurt. One really good reason to note it is that for the same reason an attacker might want to know the version, a defender (such as an employee) might want to as well. I've noted exploitable versions of software found to other divisions of the company I was working at before. For the attacker, it's really not much of an issue anyway, they'll just throw every exploit at it anyway (my webserver logs were always filled with random exploit attempts such as for wordpress and IIS).