they will, because they can, except for the last bit, but you are right how will pilots actually end up managing the final flight segment if conditions are not erhm, exactly VFR.
It is well rehearsed but the point is you establish that the final segment will be VFR, but the EIR enables you to overfly en route IMC (or even en route in IMC), because, to be fair the TAFS are rarely that wrong.