Yes, the problem with that would be that the tornado would probably glitch out since the block can't travel throu other blocks. That is why I destroy them, so that the tornado will continue working as it should. :)
Some ideas:
boolean whether or not a tornado can pick up waterblocks(and lava) (or maybe completly disable flying water blocks because this is not very realistic...)
I think it would be nice if you could also decide whether or not the fallingblocks should be placed
boolean whether or not entities should be picked up
EDIT: boolean whether or not blocks should be picked up
EDIT: boolean whether or not "real" blocks should be picked up (what I suggest is to create those picked up blocks ONLY and not remove them from landscape)
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