Yeah, can't say I'm a fan of the idea of requiring a Force user to split their XP even more than they already have to between talents, skills, and Force powers.
Honestly, I can't see what the huge aversion to allowing a Force user the option of Discipline or Mechanics to upgrade their 'saber crystal really is, or even just the notion of letting them add boost dice equal to their Force Rating as someone else had suggested (and something I even used in my Ways of the Force for the Discipline check to construct a lightsaber).
Aside from all the things we have said...
The talent comprehend Technology is designed to do basically what you're saying. And for LS, this would render the talent pretty null (and to be fair, the artisan would probably be using it a lot on his/her LS.
It's not really a huge deal Dono. But it's power creep. it's a little here, a little from making parry/reflect better. it's a little in making the improved one's better. it's just these little bits of extra where suddenly the force users have a substantial leg up because they can specialize, and not suffer the same draw backs as non-force using characters for that specialization.
But I don't know how much more can be said that hasn't already, except to present alternatives, and maybe one will stick. Because I agree that there should be some aspect of bonding with a saber crystal, but not the full extent of the mods as presented in the book.