Sure, I can explain this. There are 4 types of graph fields in the particle system: base, variation, life, and scale fields. If we take a property like particle speed, we write these fields like this:

* Speed
* SpeedVariation
* SpeedLife
* SpeedScale

Now, some properties use all 4 types like Speed, others only use 3 types. Currently, the property of particle life is written like this:

* Lifetime
* LifetimeVariation
* LifeScale

I'd like to change that last field to match the other 2 so it would then be "LifetimeScale". I think there is a high chance that people out of habit are going to assume the scale field uses the same "base" name of "Lifetime" instead of just "Life" and get errors when trying to play their particle effects.

So yes, this change would break anyone's existing ParticleAssets if they used the "LifeScale" field but I doubt this applies to many people because:

1. There is currently no documentation on the particle system.
2. The scale fields are not typically used in particle effect creation (none of the included assets or the ones I made with the ParticleViewer use scale fields). Normally, you use the base, variation, and life fields to make a particle effect, and the scale fields come into play when you need to make copies of your effect to handle stuff like scaling up/down for different screen resolutions.