Generally mitzvos have specific פרטים and שיעורים. For example, the Torah says to bentch (ברכת המזון) once satiated - however it's not left up to each person to decide if they feel satiated - but rather there's a specific שיעור - thus a 100 lb man and 400 lb man have the same שיעור. Otherwise, the Q is asked נתן דבריך לשעירים
The RambaN in Devarim 6:18 re: ועשית הטוב והישר explains that מצות כלליות are "catch alls" (my term) as it's impossible to detail every action - however he doesn't say that things are subjective (i.e. what would apply to one person doesn't apply to another)
Q - Are there mitzvos where it IS subjective to the specific person/situation? How can you tell? Are mitzvos כללי in that category? (please include sources מראה מקומות that point out how the details are subjective) (Note when I refer to "mitzvos" I don't mean specifically those counted amongst the 613, but rather something commanded/forbidden דאורייתא (from the Torah)
To clarify - most (all?) mitzvos have DEFINED peratim by which make them applicable to some but not others. I'm asking where there are NO defined peratim, but rather the goal being commanded depends upon the person. For example - if the Torah commanded against טירחא יתירה on Shabbos in a way that is not clearly defined - such that to one person lifting up a box is excessive exertion (and forbidden) but to the professional weight lifter - lifting the one box is easy and allowed.