If you mean that in a port that isn't in Asia, that's because the baggage handlers took their sweet time. Good chance in TYO that your bags have been spinning for a while by the time you clear immigration. Even the fastest immigration clearance at NRT I had (no line straight to immigration officer), I was barely at the carousel for 5 mins when my bags showed up as the 3rd bag. That was a speedrun from getting out of the gate to out of the airport setting my record for NRT at 21 minutes from gate to train platform.
The main problem (and complaint) before was that you could lose your overhead storage bin space if you took too long. Even in J
Also you run the risk of delaying depatures since who knows how long someone will take to finish sipping their drink and slowly meander their way to the plane if you make the call after general boarding.