Technically in the US all treatments are considered permanent from a health department stand point. The treatments can not be washed off. Because these treatments require opening the skin, all proper sterilization and sanitation needs to be practiced. This is very confusing for the consumer. Some may think they want something semi permanent for a fear of commitment. Some may think they want something to last forever so they never need to worry about it again.
Since the skin is a living breathing organism it is desirable to have pigments that fade over time. Our skin and appearance change over time. Trends change over time. The fading process allows us to make tweaks as the years go on to adopt to a look that is constantly current and flattering. In years past traditional carbon based tattoo ink was used for permanent makeup. It lasted much longer and usually aged to a very unflattering color. Pigments have advanced a great deal in recent years. Now pigments are made specially for the permanent makeup industry and specifically for the face. The skin on the face is very different than the rest of the body.
The combination of advancements in pigments and the fading process allows for a beautiful cosmetic solution that won’t simply be washed off, but can be tweaked as years go on.