Oh, I definitely agree! And as @Kelly of the Phoenix points out, there is pretty good evidence that at least in some traditions there have been considerable changes over fairly short periods of time. I'm all for being adaptable, and any good storyteller knows, you should have long and short versions, as well as variations, to account for differing needs and audiences...
Exactly. That's how these stories stay alive over the centuries. Their relevance is dependent on having actual meaning to the cultures telling and hearing them.
While it's certainly interesting to find the "original" form (for example, the oldest form I know of of the "sleeping princess woken by a prince" narrative is that of the Valkyrie Brunhilda), it's generally little more than a niche interest.
The vast bulk of the fairy tales that the Grimm brothers collected aren't really part of my own oral tradition, and referencing them around friends wouldn't make any sense. But that is partially because these stories didn't have much in the way of relevance to modern culture.
That's why Disney's adaptations of fairy tales completely rework the source material, because their versions have more relevance to the cultures that they cater to.