The parents are I think talking past each other somewhat, because there are really three kinds of Internet service and you're talking about two of them as if they're the same thing:
1. Consumer/Residential: speed is "up to", throughput is highly asymmetrical, QoS is best effort, reliability is "mostly works", if you are lucky you will get a human if you call for support. If you complain about service typically the response is a shrug. Generally the service is whatever the provider defines it to be and you either buy it or you don't. Often static IP is not available. Cost: $20-100/mo.
2. Business: Sold by the same providers as #1. Much the same service, except (this varies) : dedicated channels on HFC, different traffic shaping, static IP allowed, perhaps even subnets, if you are really lucky reverse DNS is supported. Generally you get a human when you call support. If you complain about service they might do some basic investigation. In the case of our cableco they have different humans knocking on your door for install and trouble shooting (perhaps the more knowledgeable and more senior folks?). Cost: $50-200/mo
ISP upstream/Dedicated/Real Connectivity: The name varies but this what one of the parent posts calls "Business". The service an ISP would get, or a big tech company, etc. You typically get an SLA with specified maximum packet loss rates and latency profile. Throughput is symmetric. Local loop is typically fiber. You can run your own BGP, HSPR etc is supported. IPv6 is always available. You can call the provider's NOC directly and have a conversation about why they're dropping packets in one direction to some obscure peer somewhere in the world. They'll investigate and resolve the problem asap. If you accidentally power off your edge router one of their NOC staff will call your call phone within minutes asking why there's no traffic on your link. Cost: $1000/mo+
1. Consumer/Residential: speed is "up to", throughput is highly asymmetrical, QoS is best effort, reliability is "mostly works", if you are lucky you will get a human if you call for support. If you complain about service typically the response is a shrug. Generally the service is whatever the provider defines it to be and you either buy it or you don't. Often static IP is not available. Cost: $20-100/mo.
2. Business: Sold by the same providers as #1. Much the same service, except (this varies) : dedicated channels on HFC, different traffic shaping, static IP allowed, perhaps even subnets, if you are really lucky reverse DNS is supported. Generally you get a human when you call support. If you complain about service they might do some basic investigation. In the case of our cableco they have different humans knocking on your door for install and trouble shooting (perhaps the more knowledgeable and more senior folks?). Cost: $50-200/mo
ISP upstream/Dedicated/Real Connectivity: The name varies but this what one of the parent posts calls "Business". The service an ISP would get, or a big tech company, etc. You typically get an SLA with specified maximum packet loss rates and latency profile. Throughput is symmetric. Local loop is typically fiber. You can run your own BGP, HSPR etc is supported. IPv6 is always available. You can call the provider's NOC directly and have a conversation about why they're dropping packets in one direction to some obscure peer somewhere in the world. They'll investigate and resolve the problem asap. If you accidentally power off your edge router one of their NOC staff will call your call phone within minutes asking why there's no traffic on your link. Cost: $1000/mo+
Source: I ran an ISP for 10 years.