> My house's front door lock is broadly the same interface as my great-grandparent's front door lock

True, but your house's front door lock is very likely to offer quite poor security. Most house locks are vulnerable to bumping attacks that are almost trivial to pull off. The only reason this is acceptable is the threat model you're dealing with when securing a physical house is very different from securing an internet-connected computer.

Moreover, while the threats against your front door have remained marginally the same as those against your great-grandparent's door, computers and the network they are operating in change extremely frequently. All the security recommendations you're naming were quite reasonable for their time but rapidly became outdated.