Textbooks are obscenely limited. Interactive feedback is gone, animation is gone. I mean trigonometry is so much easier to understand if you have moving visuali

Textbooks are obscenely limited. Interactive feedback is gone, animation is gone. I mean trigonometry is so much easier to understand if you have moving visualizations of what everything means. And because of the obscene costs of textbooks, and the various moats that publishers have, including book-specific curricula, and the very low effort options they have for homework assigning and grading student get tied into a shitty ecosystem at great cost with zero optionality. And how many students have spent how many hours of their lives reinventing the wheel to build mental models to do shit that was done decades ago? As opposed to the internet, where you can find a variety of options using different modalities and have direct feedback visually, numerically or otherwise through parametric models that can give you instantaneous feedback. Shit even Desmos alone can give you a huge deal of insight by tossing variables in and instantly seeing the results as opposed to taking 3 minutes every time you change a var with the TI-84 CE bullshit academia forces onto students. Oh and it's all free of cost. Shit there are even open source textbooks now, but nobody uses them.