Silly analogy as there's no reason to expect a snow plow on a two-wheel drive compact car.
It is reasonable to expect a tablet to have things like Flash support, an accessible file system, drag and drop file transfers native to the OS, having all apps able to access the file system so you never have to load files into individual apps, SD slots, USB ports, etc. etc. that people have been complaining about.
Now, some go to far as the iPad is still great as a media consumption tablet with those shortcomings IMO. But it is reasonable for those of us looking for a more productivity oriented tablet (that's not a full tablet PC) to lament the absence of such features.
They're not akin to wishing your civic had a snow plow. It's akin to wishing it had AC, a CD player or satellite radio, power locks and windows, key less entry etc.--you know pretty standard features for nice compact cars.