I really wonder, though, if after all, we truly want to replace the traditional banking system with this one, knowing that it won't be handled by the average user same like in terms of security.
All the average user really needs to know is that they should verify their software, store their seed phrase on paper, and maybe buy a reputable hardware wallet. They do not need to know how to verify k values, or even what k values are. They do not need to know the majority of things we have been discussing to be able to use bitcoin securely and safely. How many people do you think could change the head gasket on their car, or even identify what the head gasket is? Not many, and yet billions of people safely drive a car every day.
We know that the average user human will not be responsible for his own wealth, but we feel like we have to get rid of the dollar and replace it with something that can't be controlled by a central authority located in the society where people can be assisted, but rather, forces them to be responsible for something they weren't before.
Because they should at least have that choice.
Allow me to use another analogy. In the field of medicine, until fairly recently we would practice what is termed "paternalistic medicine". This is the idea that the doctor/physician knows best, and the patient should simply do as they are told. The patient comes with a problem, the doctor diagnoses it, prescribes the best treatment, and the patient does as they are instructed.
There are a lot of problems with this approach. Let's say I'm treating someone for cancer. Invasive surgery and chemotherapy gives the best chance of survival, so that's what the patient should do, no questions asked. But what if the patient doesn't want to spend months or years essentially bedridden and dealing with the side effects of chemo, and would rather live their remaining time to the full? The patient has no autonomy here. An authority figure has simply dictated what they must do.
Now we are moving towards what we call shared decision making. Now the physician presents the patient with options - we could do this, or we could do that, or we could do nothing at all. What's important to you, the patient? The patient takes responsibility for their own health. Some patients may not want to do this, and that's fine. They can opt to go back to the doctor telling them what they should do. But at least that is a conscious decision on their part and hasn't just been dictated to them. At least they had the choice.
Now, if a person wants to opt out of financial autonomy and trust a third party to store their wealth, then that is their choice. But it needs to be a choice, and not just dictated to them from some government authority figure.