Doesn’t the Blue Route already connect I-95 with I-76 (the turnpike)?
No. In that area, the turnpike is I-276. The turnpike is I-76 until the Valley Forge interchange, then you either exit onto the non-toll I-76 into Philly (aka the Schuykill Expressway) or continue on the turnpike as I-276, which eventually connects to the NJ turnpike.
The Blue Route (I-476) does connect I-76 to I-95, but at the point it connects at I-76, it is not the turnpike.
It connected everytime I took it.