All of these things assume that you've got a polite opponent (and that you the player is similarly polite) who'll let 2 units just attack each-other each turn. That doesn't happen.
Thorns have to get across the battlefield to do anything. And they can and should be inhibited by cold, slow, traps, ice shards and anything else. Dragons will attack first turn. Dragons can hit 2 targets at once, or anywhere up to what, 7 with its special. Dragons reduce the defence of each stack they hit and kill 6.5-13% of the stack per turn. Dragons can hit fire- or magic-damage stacks and basically ignore the retal.
In nearly every practical scenario, dragons will outdamage thorns.
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