Ia the city really the whole 50 block area now
Yes, and that's one major factor that makes it more difficult to make an impact by bombing the strats. It takes far more bombs to kill the city now. Not any longer just a big bomb into a few clusters each and it's done. Which does make sense as there is only one single city for the whole country now, but...
The complaint seems to be you cannot effect strats by yourself.
I think it's very reasonable that one single player shouldn't make a huge difference on the war by bombing the strats all by himself alone. It should take a huge combined effort, either by a big raid or by a lot of separate, single sorties to crush the key strategic target. (But also keep in mind that if the strats had a more critical influence, they would be much more defended by players too)
But as explained earlier, the overall balance is broken. It's
far more economical for a big mission to crush & grab enemy bases than to spend 1-2 hours attacking the city & factories. Tactical missions are always that much more efficient, no matter how many players are taking part, that attacking the strats is almost no option.
I think the main reason for wishing that bombing factories at least gives better score is to increase gameplay diversity beyond the tactical basegrabs or the very hard to intercept milkrunning town center sorties. Changing the role & importance of the strategic targets would be the better way, of course. There had been many good proposals for this in the past, ranging from quick fixes to fundamental gameplay changes.
And at last let's not forget that making the strats a high-value target would finally give the B-29 a purpose in the game, as this would be a mission profile where the 29 would finally be a significantly better choice for than the standard heavy bombers.