Up until a few weeks ago, we had the whole issue clickable. It'd toggle the select checkbox for bulk actions across multiple issues/pulls. However, we opted to skip that as missing a click on say a milestone name, user avatar, or label would then toggle that issue's selection. It'd be even worse if the accidental clicks sent you to a specific issue as you'd get inadvertent loads and have to go back.
Bottom line? Too frustrating for common use, so we skipped it.
Bottom line? Too frustrating for common use, so we skipped it.