If the blade remains crackly when passed to Ben then it works really well as a metaphor/imagery.

He’s always wanted to emulate Vader, but failed => He’s always had a red blade, but broken
He finally rejects his darker legacy => He throws his red blade into the ocean
He begins to turn to the light and embrace Rey, but he’s still broken => Rey hands him her blue saber, but broken

Plus, we know he’s always considered the Anakin saber his birthright - this way he finally gets it, but incomplete, imperfect.