400 Mbps will handle a lot more than you have listed. Almost every American household can get along just fine with 400 Mbps. Actually they can get by with far less.
Anything more is a sales pitch by the internet providers. They sell higher priced plans because it is all profit. It's a scam. They know the
typical household cannot use all the bandwidth they are sold. Before I get flamed, I am not talking about someone who downloads or uploads massive files as part of their day. I say TYPICAL American family.
Part of the scam for some companies is to give the "clueless" family a garbage router included with their low cost plan. It's the range of of the router, not the bandwidth.
So the family gets upset and thinks 200 to 400 Mbps is too slow. They upgrade to a more costly plan, better router (this I do know in some cases) or possibly pushed through a firmware upgrade (this I do not know) better performance that could have been with the slower service.
Your system can stream with 4 or more TVs in 4K plus all your security cameras, a couple laptops and desktops, a few cell phones, Wifi thermostats, Wifi security systems, Wifi door locks, Wifi doorbell camera and Wifi garage door opener. Pretty much anything a family of 4 can throw into the demand mix.
Even new compression codecs require even less bandwidth so people can freely downgrade their service. *LOL*
I hooked up a lot of Wifi security in customers homes in my pre-retirement career. Some of the Wifi networks are laughable, people clueless, paying for speed they arent getting. a Complete mess. So they "upgrade"
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Source -
https://www.synopi.com/bandwidth-required-for-hd-fhd-4k-video