Sure, but what specifically is appearing in the error.log that a moderator would benefit in having access to?
You’re asking for a Contribute > Feature here, you need to go beyond ‘I want x’ and the why has to really expand beyond specifics of a particular instance.
If there’s information appearing in the error.log which is valuable to moderators in general then you can potentially make a case for it. On the other hand this could just be specific to the way the instance you refer to is operated, in which case asking for a change to Discourse itself doesn’t make heaps of sense.