As a Roblox developer, it is much too difficult to create effective rain particles (as an example) due to the inability for particles to be locked to a specific plane as determined by it’s parent’s orientation. Particles turn towards the camera like billboard GUIs and surely no one wants sideways rain.
With [a property/some properties] regarding plane locking particles, particles can further contribute to outstanding maps and usage of them, such as the rain idea discussed in the initial paragraph. In a number of cases, particles turning to face the desirable can be unsightly where maps focus on attention to detail, and making brick particles isn’t an insanely great alternative.