I totally get your first point, and that’s why I’m mostly presenting this as an optional self-accountability mechanism. Think of it as a companion to Hard Mode because it is another tool to adjust your algorithmically-generated street count towards what is your true street count.
Regarding the latter (fixing GPS tracks), see a couple options (web-based or application-based) here: Manually Drawing a Run (but not necessarily a Route) - #2 by kevincharlespels