For each existing photo there is a date in which photo was taken, this is clearly visible in app and web, for second part of question: you have an input what amount of clouds you accept, if there is more clouds photo is most likely not even captured
Ad.1 it is very hard to give exact number because it’s based on many variables but still you have fairly good explanation of what you can get in each category
Ad.2 how would you do it differently? Like with power of thought? :D
Ad.3 imagine someone sent big camera into space… would you hire excavator to dig 30cm hole in your backyard? :)