But again, most users that can't operate an adblocker also cannot be trusted to browse the Internet without one.
You're describing this setup like it's a choice between complicating someone's life or giving them a simple browser that just works. Phishing attacks are nasty. No matter what choice you make, a new user is going to have a complicated element they need to be educated about. You either have to teach them to use an adblocker, or you need to teach them Internet security best practices.
To jump back to the same comparison I made earlier, this is like wiring a house without circuit breakers because the owner is too scared to mess with the little switches. Is it simpler? Sure, but it stops being simpler when their house burns down.
Nontechnical users click on things; they particularly click on flashing banners that tell them they've won prizes, and they particularly click on images with scary fonts that tell them that their Facebook has the virus and needs to be updated. If you're going to give a nontechnical user a browser without an adblocker, you need some kind of other defense against phishing attacks, fake download links, cryptocurrency miners, and compromised Ads/CDNs that scrape credentials out of payment forms.
Do you have an alternative defense? If not, then I really feel like for someone as tech-illiterate as you're describing, giving them a bare browser is roughly the equivalent of throwing them naked into a hostile environment.