Aquarius remigis has many issues. It is way over suggested by the cv on iNat. Then there are taxonomic issues, which you can read about under “remarks” on this page (which I wrote) https://bugguide.net/node/view/114655
It is true that they can be quite difficult to separate, and characteristics listed in keys are often not visible from many photos here. But there are other differences, and after looking at thousands of specimens of many different taxa and reading through much of the primary literature, I can id most to genus or species groups based on decent photos. Decent photos are important, and you also have be able to separate adults from nymphs, which can look similar among different subfamilies.
I do most of the ids on BugGuide now, but your best bet is to post things here, and it’s easier for me to find new observations.