There's an "Intro to Quantum Mechanics" section that covers what's strictly necessary to understand quantum algorithms.
For lectures, John Preskill's lectures from the Quantum Computation course at CalTech: https://youtube.com/playlist?list=PL0ojjrEqIyPy-1RRD8cTD_lF1...
There's more reactions here. I think devs have lost the plot, tbh.
What is weird is how much people talk about how other people react. Modern social media is weird