I agree about the Promenade/Kinsley areas. But none of that has been reconfigured in the last 50 years, so I took your comment to refer to the 1990s era river-relocation project that created Waterplace Park etc.

As far as burying the 6/10 connector, that recent proposal was a pleasant fantasy. It failed for the same reasons that sunken highways across the nation remain uncovered: expense.

Unfortunately, decking over highways or rail lines in the United States is wildly expensive- mostly due not to actual technical costs, but to the cascade of bureaucratic regulatory costs, which have killed almost every project of this type since the big dig in Boston.

Fun fact: The 6/10 connector is now widely blamed for severing the connecting urban fabric between Federal Hill and Olneyville. In fact, that connection was severed decades before, by rail lines.

The highway paralleled those rail lines, and surely reinforced the separation. But it isn’t accurate to say that the 6/10 connector was what cut these neighborhoods apart. That had already been done by the railroad right of way, decades before.

Edit: typo