I disagree with your last sentence. As someone who runs a few online businesses, the goal is to move the traffic from the walled garden directly to the domain as much as possible. TikTok, Google, Facebook and all the rest can derank or ban you with no reason at all at any moment, imploding your business overnight. It presents an untenable level of risk that I think a lot of people overlook. For that reason, a strong domain remains extremely important.