@d2lover
That is a good question about Lo Shako. Few considerations for an answer
1. Lightning is the most important resistance
- trappers are very dangerous and are often around in one form or another. Having 85 resist option is beneficial to have. That being said, best option is to use Wisp Projector 20% absorb (also having Oak minion) which negates the need for Lo.
Using Lo is always providing a benefit, but it shines if used with either another Lo or with 12% absorb from Wisp. So, if you don't have strong Wisp, then Lo investment may be worth it.
2. Damage reduction is not easy to come by
- 8% from enigma, additional possible 15% from belt, total of 23%. 1.13 Shako has 10% for the total of 33%. Nearly always there are two physical damage characters around which means DR% is important to have. Are you willing to play with 33% DR (if not using Stormshield) as a standard setup to actually benefit from Lo slot? That is the primary question to answer. Otherwise Lo Shako is mostly 1v1 item.
Overall, Lo or Vex in helm is rarely useful for stated reasons. Maybe for assassins who get DR from Fade and possibly some Stormshield characters (then problem is the FCR).