It also prevents grout trapping in the texture. However, this is easily cleaned. Actually the iron oxide pigments used in concrete products do not fade. Nor do the colored clays in clay products. The appearance of fading is actually from light efflorescence and can be stopped by sealing with the appropriate Aldon sealer.
All concrete products are subject to damage from acids.
However, the appropriate Aldon sealer prevents this. You have an option to eliminate the concern over traffic wear - its called Aldon Lifeguard . Creates a new floor surface in 30 minutes. No skill is required. For a less glossy, usually invisible, coating see Aldon Tile Cover .