There are certain kinds of things you can do basically, just once. It's very much "come at the king, best not miss". 9/11 was one example, the Putsch of January 6 is another.
-- Bin Laden when he planned 9/11 was exploiting the kind of open tent nature of international airports before 2001. For those too young to remember, before 9/11 there was no TSA. You did have X-rays and a security check and certain items you couldn't carry but it wasn't as extensive as now, and nor did you have to say remove your belt, shoes and socks or any metallic stuff to go through. It was also possible for family to accompany you all the way to the Boarding Gate and say goodbye. Bin Laden came up with the idea of combining suicide bombing (which was innovated by Sri Lankan terrorists in the 1980s against the government of India, including the one who assassinated a Prime Minister) and combining it with hijacking (which is a classic old terrorist standby going back to the '70s extremists) and did something nobody really expected and predicted, and exploited a weakness that nobody noticed. The crowds of international airport were filled with people who didn't take flights and so on, that meant fewer eyes to notice stuff and easy to blend in. And since he knew that doing this kind of attack would result in changes that make it impossible, he intended it to be the biggest terrorist attack of all time and so it is. Bin Laden went for the king, and he didn't miss.
-- The Putsch also depended on it being a first-of-its-kind novelty. There's never been an attempt to outright interrupt the certification of an election, the idea of physically storming Capitol Hill is the stuff of bad B-movies (and so was 9/11, the idea of destroying US monuments was a staple of action and disaster movies from the '70s to '90s). And then it happens. Unlike Bin Laden, Trump had no sense of occassion, he didn't realize this was a "go big or go home" moment of the kind he's not going to get a chance to do again.
Trump lacked Bin Laden's real evil genius and we should be grateful for that.