It’s not missing a factor that was an issue, but jumping from size to difficulty without justification.
“All cats are mammals therefore all cats are blue.” The conclusion being false isn’t a logical fallacy. However because the conclusion isn’t supported by the argument it is a fallacy.
It common to see this kind of fallacy for example: “Smart people learn things faster, therefore all experts are smart.” Yes, you just said two things that seem related, but that doesn’t mean the first statement implies the second.
“All cats are mammals therefore all cats are blue.” The conclusion being false isn’t a logical fallacy. However because the conclusion isn’t supported by the argument it is a fallacy.
It common to see this kind of fallacy for example: “Smart people learn things faster, therefore all experts are smart.” Yes, you just said two things that seem related, but that doesn’t mean the first statement implies the second.