[Skullcatrons]

Hey hey, Skull here

Shine Knighting is perhaps one of the most impractical transformation skill to use, not because it's actually good, but because the criteria to use it is annoying as hell. If you're walking down the path of Shine Knighter, chances are you're going to have to build STR and FAI to make it viable. Which means, of course yes you're going to have to deal with clusterfuck of a stat-spread. 

You cannot two-hand a Shine sword because if you do, you miss out the potential opportunities to cast Light-spells like Graft, Shine Ray, etc. Because you have all this faith which is going into your funny glowing lightsaber. So you have to abandon the two-handing which would've been a big boon to have, to slap your off-hand with funni monk staff so you can actually cast spells. (Monk staves are 70% STR, 40% FAI in case you don't know why), and so you're ending up to be this weird dual-wielding BK/Priest (You're not going Ghost/Priest are you.. senpai?)

So needless to say, while the Shine Sword grants you +2 WIL, and FAI. It is designed to compensate for the weird stat-fuckery you're walking into because not only are you suffering from stat-spread due to off-hand being used for a monk stave, if you don't. Then you can't take advantage of FAITH to use spells. 

Now some of you will ask, "But wouldn't that just be solved by shine-knighting, and getting 5 stats across the board?" well sweet honeypot.

Again, you're missing out two-handing benefits, you're also being held back by the off-hand being used for monk stave, you'll also need to acquire a Shine sword.

Also, if we're having this conversation because of 100% Dark/Light Res? What about 100% Dark Res umbral? 

But yes, for those who don't wanna read this. The TLDR are:

Pro:
100% Immunity to Light/Dark,
-Hit reduction equal to level to all enemies near you,
+stats to any nearby allies to your location
+2 WIL/FAI

Cons:
Requires STR/FAI scaling (which means using FAI for something), requiring you to delegate off-hand for casting tools.
With above con, cannot get two-handing SWA bonus therefore unless you're going to "fuck it" and just grab FAI and ignore light spells, then it's kind of a waste of your time to grab this sword.
Requires you to actually find a shine-sword either as a drop, or someone to craft it for you (Great Six exclusive crafting at this time).
Requires Chimera eyes, and grinding to unlocks as well.
Can be boonstripped.

Truthfully, some people had decided to entirety abandon Shine swords because it's actually subpar. Spelledge weapon series generally outperforms Shine sword by being more accessible, and easier to build with.  

If you wants to nerf the Shine-sword, you would have to compensate for the inevitable weaknesses it'll just gain.