Nah fr I've been meaning to come back and chat about this for a while.
The ao3 tagging system is what we want. As a fic author and reader, it's preferable.
Compared to the hot garbage mess that is ff.net and Wattpad, ao3 is phenomenal at what it does - you can basically filter out anything that you don't like and hone down very specifically on what you do, very easily. It might look a lil unwieldy from the outside but it is a vast, vast step up and quite fast to learn.
However, some authors, like this one, do not know or respect the etiquette - which i think actually is mentioned in the site's TOS - which boils down to "don't overtag, please don't overtag". A handful is fine, but this behaviour... It really sucks.