You're confusing the contract multiplier with the minimum tick size. They're 2 different things.
They did not reduce the minimum tick for the mini Russell 2000. The minimum tick size was 0.10 and still is 0.10.
What they did was reduce the contract multiplier from $100 to $50. So, before, a single point (1.00) was worth $100, but now 1 point is worth $50.
0.10 x $100 is $10 <--- the old minimum price fluctuation
0.10 x $50 is $5 <--- the new minimum price fluctuation
This change, by the way, was a huge mistake in my opinion. Did volume double as a result? Did liquidity double? Last I checked the answer is no. That means that the only thing this change do was reduce volume and reduce liquidity... in other words, people should be getting fired and the top executives should issue an apology for being dumb-dumbs.
If 4 contracts is too risky for you, you're clearly undercapitalized for e-minis. The solution is to trade e-micros. There's lots of e-micro currency futures, there's e-micro gold, etc.
I am not confusing nothing
In short, the Mini Nasdaq has become too big.
ICE did the right thing to split the contract value of the RTY (TF) to half value
CME has to take the same decision, period
Your "solution" to trade micros is offensive to my intelligence and to your intelligence...
As regards the DAX....well there's the mini Dax that is 5 times smaller