Where do you get that "casual people overall agree," "everyone just takes the banned list as a benchmark," "any casual form will basically ignore the banned list"? Got any evidence? Any poll?
Yes, the EDHREC salty list is made of over 3,471,000 votes do give the cards in question a salt-score.
Its WAY more comprehensive than the limited banned list.
The massive amount of decks uploaded on the site is also a pretty defining indicator what people actually enjoy to play and what they better let on the bench if they make casual decks and not competitive ones.
The only thing that doesn't work is trying to make a banlist that covers both casual and competitive. But that problem isn't the fault of the established list and rules committee who have made it clear they care about casual play; it's a problem made by people wanting to co-opt an existing format and twist it to their own ends at the expense of those it was made for.
The existence of an "official" banned list for the format is what produces this issue of having only 1 list.
If they realized that, they could certainly have 2 lists, with both directions in mind and thats not even complicated or much work, its just that you have to do it, or you dont and people will rightfully forever critique that problem.
In the end being the "official" list carries weight no matter who likes it or not.
Like the salty card list or not, edhrec.com is still one of the most defining and comprehensive sites for the Commander format and has plenty of data to see what cards work best in the format and which ones are problematic.
You're also assuming everyone uploads their lists to a site EDHRec gets from. Lots of people still used TappedOut (which EDHRec doesn't dredge decklists from), and exponentially more don't upload lists online at all. The more enfranchised group EDHRec pulls from is also highly susceptible to content creator-mediated swings, like a spike in certain commanders when a famous content creator makes a deck tech video. Not saying it's not a large source of data, but it's not completely unbiased data either.
According to one of my friends at my locals, the cEDH community didn't take the recent ban on Golos, Tireless Pilgrim too lightly as someone just started an online petition to convince the EDH Rules Committee to unban Golos for EDH / Commander claiming that their recent bans / unbans as of late proves that they're completely out of touch with the format. There was already speculation that the EDH Rules Committee was pushing for the cEDH community to create their own separate ban list for cEDH instead of following the traditional ban list for EDH / Commander back when Hullbreacher got banned from the format because it was more of a linchpin card for the competitive side of the format compared to casual where it was more oppressive. If you've seen that one Game Knights episode where Cassius Marsh pressured Josh Lee Kwai into casting Deflecting Swat to save the playgroup from Hullbreacher then you know what I'm talking about. Cassius tried to deny everyone cards by casting Timetwister with Hullbreacher to net Treasure tokens.
Why the hell do "cEDH players" care about Golos being banned? It's not played there outside of some 5-color Turbo Naus build that wants Boseiju, Who Shelters All in their command zone, but Codie has eaten that surprisingly small space almost entirely.
Wonder how long the Worldfire price spike will last before people abandon it for either being too boring and/or annoying. Sheldon Menery said he hopes it's more Painter's Servant situation than re-banned Rofellos.