We only truncate the captions on mobile and only if the are longer than a set number of characters. If I recall, the thinking was that the captions might be pretty long on some galleries and we didn't want to detract too much from the visual experience for readers who just wanted to scroll through the gallery without reading 100% of the text.

I'm glad to hear you enjoyed the gallery even on a phone. Making an image heavy page work well like these is always tricky for mobile, but it's an experience we care about and plan on improving in the future.