What you're saying makes sense, thank you.
I'm wondering though, are you saying it because the study did indeed fail to account for all those factors or are you basing it my (probably poor) interpretation/description of it? :-) If you're going off my comments, I may have done a disservice as my laypersons understanding of the topic is pretty rudimentary.
FWIW, the study does indeed model other countries like the US and Italy so I'd be surprised if much of what you speak of was not taken into account.
I certainly don't think they modeled one nation and simply extrapolated that out into the world without other considerations. I apologise if my words gave that impression... Even I can see how stupid that would be.
Here's the link if anyone is interested https://www.nature.com/articles/s41586-020-2404-8_reference....
"Received: 22 March 2020" - direct from the study cover page at https://www.nature.com/articles/s41586-020-2404-8_reference....
States imposed lockdowns between March 21 and early April. Someone want to explain to me how a study submitted before the lockdowns were issued (nevermind had time to actually have an impact) "found" those results?