>>1238263American English has this idiom "red headed stepchild".
Of course by population count and density they come as the fourth or even less in the city importance rank. Their sub-region is like 247k people. Btw, I used the sub-region population as an approximation for the metropolitan areas, I suppose that gives a few hundred thousand people too big a number for Helsinki.
About 250k people is at least an European threshold for enhanced transit infrastructure, meaning establishment of bus lanes, branded trunk routes, live information displays and BRT/LRT feasibility studies.