Anyone with a driver's license can use a car. People don't normally have to be able to install engine components and tune it before they can drive it.
Internet technology can be confusing for anyone without specialist knowledge, but older people generally have bigger problems if things don't work or they have to set something up. Especially if they have no prior experience with this kind of thing. Because Internet access has now pretty much become a necessity, just like a phone, those who do not understand what a LAN cable is have every right to expect full support when they find themselves forced to buy into this technology. It is not enough for a company to just blithely say here is your modem, go figure it out or find a relative to do it for you.
My 65 year old father came up to stay with me for a week recently. He had a choice between a 2019 Corolla and a 2010 Corolla. He drove the newer one twice and then refused to. Didn't like the auto handbrake and various sensors beeping and telling him what to do. What is Toyota supposed to do? I remember the instructions for about ten seconds when I pick up a new car.
I had to google how to turn the speed limit reminder person off. I've even had rental cars where some setting is buried in the menu system to change. So I don't think they're targeting the elderly/non tech savvy with modern cars either.
And to be fair, the last modem I got had pretty clear instructions on big fold out piece of durable paper. The biggest issue I have is when other people set things up, is the access to the device. For example I have my parent's gmail and iCloud settings (both mid sixties), and I have my 90 ish grandmother's iCloud settings as well. Hers was previously set up in someone in the local tech shop's name!
I don't know what the real solution is for that last one. But that said, how many 90 year olds are walking in and buying a $1000 iPhone/Pad? In my experience it's usually a hand me down or a gift.