I think for shared_from_this() I have a different use-case in mind: an object of some class wants to register with some other class. I.e. think about something like

  auto self = shared_from_this();
  document.onclick([self](){self->doit(); } );

I'm not sure there is a way to express that in C++ without use of enable_shared_from_this.

It is very easy to accidentally run this kind of code from a constructor where shared_from_this() is a 0-ptr.

make_shared also only helps in 95% of cases. E.g. it does not allow specifying a custom deleter, which is a use-case that is allowed by the shared_ptr<> constructor. It also won't fix any of the problems WRT shared_from_this() being called in the constructor.