Maybe the thinking is you can get those linemen later in the draft, but you just HAVE to get this special QB.
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Meanwhile, 3-4 of those QBs get drafted early every year, and those linemen you get later aren't as good as the linemen you'd get early.
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Basically most of the NFL front offices are still fumbling, bumbling, stumbling each year around draft time.
The same few teams seem to safely win 10+ games each year (NE, GB, SEA, PIT) despite always drafting late and the same few suck balls over and over, no matter how many high picks they get (CIN, CLE, NYJ, WAS, OAK/LV, JAX).