It is unclear to me whether you're praising the article as particularly easy to understand or complaining that it contains equations like h_t = A h_{t-1} + B

It is unclear to me whether you're praising the article as particularly easy to understand or complaining that it contains equations like h_t = A h_{t-1} + B x_t y_t = C h_t (which the author attempts to illustrate in the "My name is Jack" figure below)