1. It's not just Nanjing. Based on what I heard from other members, it seems that now we are only sending within the province across the entire province. Before the new regulations, Nanjing was the exception, but other places also seemed to be defaulting to sending nationwide plus international. This may be the result of coordination across the entire province. (The fact that the system has been adjusted internally is possible, because when I communicated with Huaian without management in April, their words were "province-wide system upgrade," so after upgrading, removing the option for nationwide connectivity makes sense.)
2. Regarding cross-provincial communication, in many cases, it can only be said that the situations differ between provinces. After all, everyone was very concerned about the Zhejiang and Shanghai U-segment situation in the Yangtze River Delta this year, but Jiangsu seems not to have followed up on it. When "violations" occur that fall outside of permitted ranges, the most common scenario is that someone reports you. After all, they also have jobs, and there are other things they need to take care of besides our circle...
3. Regarding the 15W certificate for high-power machines, I haven't seen many people in the Nanjing group discussing it recently. I'm not sure about the details, but if necessary, we could try asking around (without spending our own money – just to see if there's a solution).