Marble, quartzite, and natural travertine have qualities that engineered quartz cannot fully replicate. The movement in the stone is genuinely organic. No two slabs are identical. The depth and variation in a well-selected slab of Calacatta or Taj Mahal quartzite is something you notice every day, and it tends to look better over time rather than worse.
For a kitchen island in a luxury home, natural stone is usually the right call aesthetically. It is the surface that gets photographed, the surface guests touch and comment on, and the surface that sets the material tone for the rest of the space. Investing in a strong slab there, even if you use a more practical surface on the perimeter counters, is a choice most of my clients are happy with long-term.
The maintenance reality: marble etches and stains. Quartzite is harder and more resistant, but it is not maintenance-free. Sealing regularly, cleaning up spills quickly, and being thoughtful about what goes on the surface is the commitment that comes with natural stone. Clients who want a kitchen they can use without thinking about it often find this frustrating.