I definitely think it was a weird decision that after TLJ broke the saber in two, that JJ decided to just repair it offscreen rather than allow Rey to build a new saber from it. I thought for sure she would build a double-bladed lightsaber using the two crystals.
Well, I think repairing it was a fair way to continue the meaning, though they way they did it they essentially just had it be ‘same saber, but not broken now.’