Maybe I am arguing the same point as you here, but I am uncomfortable that you are painting the justification criteria as being debatable in these situations.
In particular, I think your criteria for justification is too low. The standard for justification is - however much is necessary to close off the possibility of something being not-wrong.
I find the JTB concept to be useful to reminder us (1) that the concept of knowledge is an ideal and (2) how vulnerable we are to deception.
As an idea survives rounds of falsification, we grow confidence that it is knowledge. But, as Descartes explained in the evil demon scenario, there is room for doubt in virtually everything we think we know. The best we can do is to strive for the ideal.
> however much is necessary to close off the possibility of something being not-wrong.
This is borderline self-referential with respect to the whole Knowledge definition, though. If you have enough information to remove the possibility of a belief being not-wrong then there's no point in defining Knowledge at all. The whole debate around the definition is that humans have to deal with imperfect information all the time, and deciding what constitutes Knowledge in that environment is a challenge.
In particular, I think your criteria for justification is too low. The standard for justification is - however much is necessary to close off the possibility of something being not-wrong.
I find the JTB concept to be useful to reminder us (1) that the concept of knowledge is an ideal and (2) how vulnerable we are to deception.
As an idea survives rounds of falsification, we grow confidence that it is knowledge. But, as Descartes explained in the evil demon scenario, there is room for doubt in virtually everything we think we know. The best we can do is to strive for the ideal.