Most if not all of those issues can solved with a proper security policy...
I’ve worked in some major corporations that did not allow access to the Internet except to approved sites and also would not allow attachments to be opened, software to be installed or removable hard drives to be plugged in....it can be done, but the average organization doesn’t have the expertise or nerve to force these things onto people..
Well you said it yourself, it’s not really useful to cut off the internet and even whitelisted sites can be hacked or have malware uploaded into them. Disallowing thumb drives and those other measures are plausible with limited permission Windows accounts. But it’s not exactly futuristic and does not inspire innovation.