You're not the first who's commented on that, but I prefer to keep them separate. I've got a set of drill bits in 0.1 mm increments from 1 mm to 10 mm and since metric threads make it really easy to work out which drill to use for a given thread (subtract pitch from thread, so M6×1 mm pitch needs a 6–1=5 mm drill bit; M4×0.7 needs a 4–0.7=3.3 mm drill bit), it's no hassle at all to just grab the drill bit needed from the set.
I can see the advantage of keeping the tapping drills close for imperial threads as it would save a step of looking up the right drill size, but I try to avoid imperial threads if I can!

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