Thanks a lot everyone, this is helpful.
Last question here - if there was a mistake or something not clear regarding his travel history would they have requested for clarification or additional documents or would they have just rejected and not listed that as a reason? I was going through the documetns again and maybe it was not clear to the officer that he always complied with travel visa stays given the way I outlined his history very vaguely - worth a try?
There was no mistake based on the info you've provided. The travel history refusal reason refers to the fact that he has never visited countries such as the US, UK, etc. where there are more stringent processes for obtaining visas. We see this refusal reason here all of the time for that reason. His travel to countries in the Asia region doesn't count unfortunately. If he has in fact travelled to one of these countries and this was missed or not highlighted in the application - then absolutely do that when you reapply. Otherwise, there's really nothing you can do to address the travel history refusal reason. You would instead want to focus on showing strong ties to his country of residence to counter balance this.