Interesting theory, but how exactly could a card be used for that purposes beyond the immi officers gut feeling? Is there an occupation which should not be entered in? If I was "chief seal clubber" I would probably already know that entering that in as my occupation is likely to get raised eyebrows but "wildlife population control expert" is not, and thus enter in the latter (assuming you don't use the generic word "consultant" which I've used myself a few times).
The rest of the questions simply relate to which state you've spent time in and how long you'll be OS. Even stating 3 days to the US gave me nothing more than a "have fun".
The only question on there which is an actual question is the are you taking more than $10,000 out of the country, and even then a verbal would probably be ok.
I think it's purely for stats purposes, from an era when computers either did not exist or were not linked.