I realize I could have been clearer re 16 to 20t jumps between chainrings--what I really was referring to was the slightly annoying factor of having to shift a lot more gears at the back when you do a chainring change. .....
That is why I do not like the concept of a wide range 2X system.
My road bike is a 2X10 system with a compact double (50/34). I avoid two or three smallest sprockets on smallest chainring, two or three biggest sprockets on biggest chainring. Thus have 14 to 16 effective gears. After I shift the front, I have to make three shifts in back. And that change over point between the two chainrings is close enough to level ground that I make that change fairly frequently.
I have a similar situation on my half step plus granny triples on my derailleur touring bikes when shifting to or from the granny gear, but i do that much less frequently because that changeover occurs on a steeper grade.
My 3X8 rando bike with a stock (no aftermarket chainrings) road triple and stock 11/32 eight speed cassette is preferable in many ways, one of which is an effective 18 gears when avoiding the cross chained gears..