If you go way back to the 5-6 speed freewheel cassette days, the typical bike was a 10 speed (really 8 speed since you can't go big/big or small/small). It stands to reason once cassettes got to 11s, you didn't really need the front derailleur/shifter any more as long as your low gears/high gears were of sufficient range. Many people also point out that a lot of the gears on the typical 2x drivetrain are duplicates, so you don't really have 22 different gears anyway.
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