Why everyone decides to leaguestart Toxic Rain

Disclaimers:

https://pastebin.com/c6PVPGE0 - POB

1)I overexaggerated that there's not other similar builds for this investment, there's few but you get my point, it's hard to beat for medium investment

2)I forgot to mention that it's also nearly curse immune through 1 flask and will be fully immune once i get some reduced shock effect implicits on jewels

3)In certain conditions it's not shock immune because for example expedition remnants can have increased shock effect, you are shock imune while normally mapping

4)I forgot to mention that it's map mod proof and expedition remant proof, there's only 1 expedition mod that you can't do and no combination of mods can be bad or brick it like max block or never crit etc.

Here's a showcase where i facetank always crit expedition mobs with 25-30% shocks on me, i never do this normally but it's a nice showcase that you really don't need to be champion in softcore environment

https://www.youtube.com/watch?v=NITH5VXwv3Y

Price of the build is probably much lower or will soon be much lower than i estimate it at because the leaguestart builds like Toxic rain gear depreciates fast and there's no double influenced pieces and not even double influenced mods on any piece of my gear, it's all very basic as i see very little improvement by pushing it further