Technicals are changing too.
My flagship trade for 2019 is the US 5/10 steepener. You have to buy $ZF vs selling $ZN.
For those who are real traders and not paper trading, risk adjusted weighten between the March ZF and ZN contracts is 1,59 : 1. This means you need to buy 8 ZF vs selling 5 ZN .
As we are basically for bonds in general, and technically we prefer buying 5y outright too, those who would like to run some outright risk may do so by selling Less 10y ( ZN ) against their 5y ( ZF ) longs. Me personally I do 2,66 : 1 ratio.