One reason is that I prefer 24-hour time. But the main reason is that my semi-automated workflow for capturing images (setting the metadata to the correct time, adding a watermark, and saving as HEIC) uses the native camera view, and I want the native datestamp for that.
I might switch to using Camect for capture eventually, but I have too many cameras for Camect, which limits that feasibility, plus some UI aspects like too-small controls (previously mentioned) make it easier to use the native UI at present.