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Simple differentiation is one thing, and solving more complex integrals is another. A lot of the concepts will just end up being retaught in university anyway because high schools don't provide the right foundation; so that class time might be better spent on other concepts.
Calculus is pretty routinely taught to 16-18 year olds in the UK and would be expected knowledge for someone starting a math degree (tbh even for engineering/physics) so the argument that it’s too complex is a little strange to me.
Disclaimer, this tweet is literally the first time I have heard about the “California calc” debate so I don’t really know what is being discussed 
Well I'm not saying it's too complex just that maybe it's not the best use of time. Tbh I don't remember exactly what calc I did in HS but I do remember that we basically did it all over again in university
On the other hand I heard that IMO problems basically never feature calc because it’s not taught to high school students in China, and they seem to do fine overall despite not studying it until college.
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