Your answer is akin to “Why don’t you just look at everything on the site that needs ID and identify it if you know what it is?” The response should be obvious: time. This site should value the time of people willing to donate their personal time towards identifying. If you demand that identifiers jump through hoops and sort through huge piles of observations they’re not interested in, you’ll end up with a deficit of IDs, which is exactly what the site has now.
Subscriptions can absolutely be changed to put an observation in my feed when it is moved into my taxa of interest. It should not function for only the first identification.
Some identifiers like @rhesusguy may not always be down in the weeds, and that would be way, way more useful if their work could be automatically handed off to those who are. If they’re going to spend the time sorting the top level buckets because that’s where their interest/knowledge/confidence is right now, the smart thing for the site to do is to then put those observations in front of the people interested in those taxa. That way everyone is working to their own interest/knowledge/confidence and everyone benefits.
I don’t have the time or inclination to look at every single observation that needs ID. Some people do. I do have the time and inclination to look at every single observation in my taxa of interest. The site should help us work together automatically.