Wikipedia is supposed to be static, without questions from readers on any engagement besides reading and maybe correcting or expanding something.
Also, no serious Wikipedia article about math or physics is thought of as an introduction. Sometimes its the other way around, its written for experts and goes into surface or line integrals, or sometimes even tensor notation, when an introduction would not.
I think this website is trying to reduce friction for user interaction and aggregating it, and also tries to curate material into different levels of difficulty. Both things merit asking for a login, for social its obvious why, and to curate for difficulty its helpful to use the feedback from users as a signal of an innadecuate label.
Also, no serious Wikipedia article about math or physics is thought of as an introduction. Sometimes its the other way around, its written for experts and goes into surface or line integrals, or sometimes even tensor notation, when an introduction would not.
I think this website is trying to reduce friction for user interaction and aggregating it, and also tries to curate material into different levels of difficulty. Both things merit asking for a login, for social its obvious why, and to curate for difficulty its helpful to use the feedback from users as a signal of an innadecuate label.