IMHO this is an electronics forum. So naturally we talk about and discuss electronics related topics. There are many general forums where about every other bit of topic can be discussed. I think the general chat section offers enough bandwith for "slightly-less-electronics-related" topics. It's up to our admin and moderators where the limits to "slightly less" are placed.
Apart from that I've experienced on another forum that an off topic section can turn into a place where a certain subset of forum users is very active, resulting (almost) in a "clan" with their own language, inside jokes etc. Almost even dictating the forum ethics (since they are long-term users and familiar with the moderators on personal level), and at least resulting in a polarization to those who belong to the clan and those who don't. This also flowed into the non-off-topic sections. Now I am not saying that this is sure to happen, it might have been just the culture of that particular forum. I just think that it should be taken into account.
Lastly, there is a risk that in time the off-topic section will overshadow the electronics sections. By that I mean that the off-topic section becomes the hang-out place instead of the electronics-related sections. I think that's very undesirable. Again, that is just my experience elsewere and YMMW.
One of the great things of the EEVBlog Forum IMHO is that every user is welcomed, and long-term users and short-term users are considered equal. In due time some members rightfully got the reputation as very knowledgable, nothing wrong with that; they still keep sharing and helping the very beginners along. I've experienced this forum as a place where first and foremost our knowledge and experience in electronics is shared. I think it should be 'that', since that works.
So my vote is a big NO to an off topic section.