I think what matters about urgency should be captured by a version of neglectedness that accounts for future resources that will otherwise be spent on the problem. If something is not urgent, we might not expect it to be neglected in the long run, as others will come to work on it. If urgent, there's a risk few will work on it in time.

I would have considered urgency an aspect of importance maybe? But it's an interesting point.

The urgency factor reminds me of a Charity Entrepreneurship blog post from a few years ago (which I can't locate now) that emphasized the importance of considering windows of opportunity when prioritizing causes. For example, preventing the development of a new industry, like octopus farming, is particularly pressing now, because the industry is still nascent. Acting now could be far easier than trying to challenge a well-established industry 5 to 10 years down the line. By having the opportunity to intervene early, we may prevent more suffering, something that may be less accessible for mature industries. So I think I would place this "opportunity/urgency factor" within "tractability", as it influences our ability to address the issue effectively at a given point in time.