I've certainly read/written fics that have BOTH a romantic AND a platonic pairing... In those situation's I've often relied on the "category" to make clear if it's balanced and both are core/central or if one in particular is much more present than the other. Like in the example you mention, I might tag it with "Wei Wuxian/Lan Wangji" and "Lan Qiren & Wei Wuxian", but then for the category have it just be "gen", as that makes clear at a glance what the focus will be while also acknowledging "Hey there is this particular ship included", especially if the romantic ship undergoes minimal/no particular development and has pretty little focus compared to the platonic relationship.
Of course I don't think this is a universal designation (and some gen-lovers might screech at a fic with any romantic relationship not being marked with a romantic category, even if the romance is not the central point), but I find it useful. I try and search a lot of femslash in BNHA which is abysmal to search, but I've noticed with "common side F/F ships", some people WILL pretty clearly tag the category as just M/M instead of M/M + F/F, so even tho both pairings appear in the relationship tags it's clear at a glance which relationship will be the focus (and I can narrow down easier with an "include F/F" search that then excludes those M/M-exclusively focused fics). I find that helpful for me at least.
On the other extreme end there are the people who tag literally all the categories but then don't even tag any relationships that could apply to... like they're tagging for traces of nuts and not even saying what nuts there might be traces of. Grinds my gears when searching the F/F category in general and there are huge fics that don't have a single F/F ship mentioned in tags/description, but unfortunately I don't get to define everyone's tagging conventions XD.
Sorry to go off on tagging nitpicks, but I do ultimately think it's a good thing that AO3 lets you tag multiple categories, and that the "&" tag exists to clearly delineate and search for specific platonic pairings, and that ppl are actually using the & tags!! Makes it much easier to find those specific flavors
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Of course I don't think this is a universal designation (and some gen-lovers might screech at a fic with any romantic relationship not being marked with a romantic category, even if the romance is not the central point), but I find it useful. I try and search a lot of femslash in BNHA which is abysmal to search, but I've noticed with "common side F/F ships", some people WILL pretty clearly tag the category as just M/M instead of M/M + F/F, so even tho both pairings appear in the relationship tags it's clear at a glance which relationship will be the focus (and I can narrow down easier with an "include F/F" search that then excludes those M/M-exclusively focused fics). I find that helpful for me at least.
On the other extreme end there are the people who tag literally all the categories but then don't even tag any relationships that could apply to... like they're tagging for traces of nuts and not even saying what nuts there might be traces of. Grinds my gears when searching the F/F category in general and there are huge fics that don't have a single F/F ship mentioned in tags/description, but unfortunately I don't get to define everyone's tagging conventions XD.
Sorry to go off on tagging nitpicks, but I do ultimately think it's a good thing that AO3 lets you tag multiple categories, and that the "&" tag exists to clearly delineate and search for specific platonic pairings, and that ppl are actually using the & tags!! Makes it much easier to find those specific flavors