Working on a multiplatform game trying to mantain a single project can be a real pain.
Settings/object are usually different depending on the platform you're working on and here's where MLIT Multiplatform comes into play!
MLIT Multiplatform allow you to have different setting for your component* for every single platform supported by Unity.
NO runtime call : It won't affect your performance!
Documentation
* Version 1.0 support Camera, Materia, Image, PostProcessingStackV2 and GameObject enabling/disabling but more are coming!