IP providers are supposed sell you a certain bandwidth for you to use as you please. Net Neutrality preserved that. Without Net Neutrality, your IP provider is free to decide which content get the best streaming speeds and which ones do not. This is especially important to "cord cutters". Without Net Neutrality, Atlantic Broadband is free to throttle back on services like YouTube TV, Netflix, Sling TV, etc.
The confusion comes from the ISPs who intentionally conflate the issue with Quality of Service, or the "cost" to provide data.
The IPSs say "we need to be to throttle Netflix content, so that we can guarantee we have enough bandwidth for telemedicine and voice over IP services for the deaf&mute". They completely ignore the fact that these are separate issues. They are free, even under the most strict NN rules, to follow class of service guidelines allowing voice to have higher priority than streaming video.
Or they will say "Netflix sends us 1000x as much data as we sent them, so they cost us a lot of money and they should pay extra", which is also a lie. This is a lie based on the way content delivery networks (the in-between networks for content providers and consumer networks). If you send the CDN 100TB of data, and they send you 120TB, you pay them for the 20TB. But nearly all ISP residential customers use more services than they provide so the balance is always against the ISP. The thing is, the customer pays for that bandwidth. All of it. 100%. So there is no reason the ISP should try to get Netflix to also pay for it, other than greed and the perceived notion that they can hold the customers ransom (I.E. make the customer experience so miserable that they stop using the service). What's even more infuriating is that most large content providers will provide ISPs localized content servers (meaning they will give Verizon a server with ALL of their content so Verizon never has to pay a cent to use someone else' network to stream said content). The only reason some choose not to, is to try and use it as an argument against NN or to support their own competing service.
Nearly every argument you hear against NN is made up from whole cloth. But the problem is that most of the people you listen to are invested in one side or the other. You watch TV? Those guys are owned by the big ISPs so you will hear mostly anti-NN arguments. Listen to the big Tech companies, those guys are most content providers and will give you pro-NN arguments. So why not just listen to your average IT nerd? The guys who do it for a living and know the ins and outs. Every one of those I have ever discussed the issue with is pro NN. You trust your doctor over the pharmaceutical commercials on the TV, right? You trust your brother in law, the auto mechanic about an issue with your car over the dealership that is trying to sell you a replacement. Why do the Anti-NN people ignore the actual experts, some of whom they may know personally, in favor of politicians who don't even know how to type an e-mail for themselves and are paid millions by the ISPs?