Right-to-left support is often reduced to a layout transform. That is a useful first step, but it misses how people scan information, how mixed Arabic and Latin data behaves, and how directional controls communicate intent.
Operational interfaces expose the limitation immediately. Currency, dates, serial numbers, and metrics may retain left-to-right order while their labels and surrounding layout reverse. A safe system needs explicit decisions for each data type, not a blanket styling rule.
Icons deserve the same attention. An arrow that means next, progress, or return must mirror only when its meaning is directional. Brand marks, playback controls, and some universal symbols should not be flipped without a semantic review.
Treat RTL as a product language rather than a CSS afterthought. Teams that do make their interfaces calmer and more predictable for every person using them.