Does anyone have any examples of real-life applications that doesn't require "strong authentication". I am looking specifically for blog posts or even scientific papers that argue that "strong authentication" is not required for all applications ... sometimes you need to authenticate users using IP addresses only, for example, but anything more than that would be unnecessary ...
EDIT: Ok, I think I need to explain myself a bit further. I am looking for an argument from a developer or a business owner or a scientist (an official statement, e.g. scientific paper, or semi-official, e.g. blog post) that argues for a "non-strong" authentication. The business owner's insight is the most important thing (that I'm looking for). For instance, @Florin Coada's example is great, but it would be better to see Apple's insight on the matter. I tried googling for days, but keywords I'm using are bringing completely irrelevant results.
EDIT 2: The answers are awesome, and maybe I should extend the question a little bit (for the last time). Would there be any kind of application, where the risk of "security breach" is high, like privacy breach of users of your service (by "power users" like skilled programmers), yet you choose to do a "weak authentication"?