Atlassian doesn't even have consistency within single products! I'm using Jira Cloud at work, and while most fields support markdown (e.g. three backticks to start a code block) there are a few that only support Jira's own notation (e.g. {code} to start a code block). It's always infuriating when I type some markdown in one of the fields that doesn't support it for some inexplicable reason.