What I like is to specify dependencies. Unfortunately, the simple ones (Github, Gitlab, Trac) don't have that feature.
The Jira we use at work has gone overboard. There is too many ways to specify and people are confused. For example, we have "blocks" (B cannot be finished without A closed) and "follows" (B cannot be started without A closed).
The Jira we use at work has gone overboard. There is too many ways to specify and people are confused. For example, we have "blocks" (B cannot be finished without A closed) and "follows" (B cannot be started without A closed).