I generally am active about keeping my inbox clean so anything in there is important, if its not then I delete it as I prune it everytime I check so not sure th

I generally am active about keeping my inbox clean so anything in there is important, if its not then I delete it as I prune it everytime I check so not sure this would really be all that useful but for some people it may be, if they're too lazy to categorize / archive emails though I doubt they are going to want to use an extra app just for this.