Dash's diff is adjusted per block yes. For your question to be a yes you have to make certain assumptions. I'm sure a quick google will clear everything up for ya.
Yeah, Dash has a commitment to low fees, Point of Sale wouldn't work otw. Whenever the price rises Dash commits to lower fees, we don't want what happened to btc to happen to us.
I agree, low fees are very important. But they don't look much lower than #BCH so the cheap algorithm either isn't working or something else is eating those savings.
That's using the avg. You have to use the median because privateSend txs skew the avg. They're about 1-5% of daily txs, and currently have a much higher fee of .01 Dash.
Actually, if you look, Dash's fees have been many times lower than bch's all year, 14x (!!) lower Jun 21 its only since Sept that BCH lowered its fees to Dash's level. Congrats!
The area under the curve since BCH was created looks about the same to me. I guess you'd have to do a more detailed analysis as to why they differ at various times.