I mean... pies are very practical in cold climates. By "bland" I think you mean that they lack spices, which is true except for pepper, but that's like saying Japanese food is a problem because it doesn't have enough jalapeños.

"Boring" is subjective, tho I think we'd agree that to a modern palate it wouldn't be very exciting to only eat British food exclusively. That can be said of any country's cuisine tho.