Actually I would argue some of those couples ARE aware of SMWW to some extent. Might not be all the comics. But there usually is some contact with pop culture along the line...from a movie or TV show. Some might even stumble on smww stuff online. It's why the phrases associated with SMWW crop up. I see Soule's stuff used all the time. From "Power Couple" To "We are each other's shelter from the storm." To "You're strong." "I Know." Then we have people who grew up with SuperFriends etc. Thing is is not so surprising people feel SMWW "feels right" That it "makes sense". These are the responses I see. Why? Because I think they know SM and WW are JL allies. They know they work together as a team within a team. They know the character's individual traits. And the traits are positive , good traits that people aspire to. And they also seem to understand on some level they have burdens and challenges and responsibilities unlike others and think...these two would understand each other better. And this is true. IMO SM and WW have a connection that no other have. Not even Batman understand the way they think because he operates from fear.
Clark and Diana are like that real life couple that works for a cause individually , say that charity dedicated to changing the world, then they came together and connected. There are many many people like this. Opposites may attract temporarily but it is a fact it is shared ideals/ goals that creates for a lasting union. And real truth and real trust is the foundation which smww always had. So real life people who might not know all of smww comic hx...they understand this. Despite what DC pumps out in movies and tv and animation...there is still this attraction to smww because they seem to sense that beyond the traditional love interests, smww is an ideal couple. I am sure it helped when they googled SMWW tons of romantic images crop up because DC does have them as a pair. To go as SMWW they would have to do some googling.
Look, it is not hard to dress up like traditional love interests for Halloween if you believe/like it and it certainly is there in movies and tv for people who don't read comics. SM have had it for decades. And WW had a huge hit recently. I see couples going as regular stuff like socket and plug , or peanut butter and jelly or stuff like that. My point is there is no reason why if something is beloved that it would not be done. Fact be way cheaper. But yet it is SMWW or CKWW year after year that keeps showing up. And growing.
I don't subscribe to any notion that SM or WW need grounding to be with anyone. They both can do that themselves. This assumes the characters can't have innate compassion, love and connection to the world unless they banging a particular human. That is ridiculous. There's a whole sort of xenophobic vibe I get with this crap DC pushes to try to justify stuff when SM and WW should always be who they are no matter their status, single or married. I see general public as understanding that better than DC. That they see their good traits and them as role models. God forbid you'd ever want a role model in a hero that chucks it all in or turns evil because he/she can't be with x or y. And it is positive and natural to want to be like these two characters. Anyone imo trying to stop people from aspiring to be a SM or a WW, or that they can't find their own SM or WW, is sad. Too often people are kept down by a many things. Told they can't be this or that. Or limited by who they are or where they come from. SMWW real life couples especially you see always talk about trying to be the best they can be. There is no limitation or boundaries. Why the heck should anyone not want to soar? Or not want a partner ( if you are looking) with SMWW qualities? Saying SMWW is too obvious is such an ignorant remark and they need to be humanized as SM is too strong or WW is an Amazon.
Being humanized has nothing to do with strength levels or culture. It's yr choices, yr heart, the way your live life and respond to its tests. It's time people challenge these out dated notions perpetuated by DC about what humanity actually is and what it means to have it. And being a hero is hard because we all have flaws. It is not easy. Being exclusively good is never easy, esp in a world where people have done crappy stuff for millenia and will continue to do so . There is the story for SMWW. Just being in a world that has always been gray and trying to make the choices they can to make the world better and definitely not making it about themselves or their relationship above everyone else. They can love each other, support each other and yes even have disagreements. Because they are independent and have their own povs. But truth, trust and respect will always be there.