It is a bit difficult to stay in a one-pane view with plans being entirely separate from a space or board. Cross-functional plan views are often helpful in team board contexts, or within a space, and with timelines disabled, requiring plans, not have the option to add a plan to a board tab is not a great experience.
Hello @fg8652
I can't tell you why Atlassian makes the decisions they have made.
An alternative to having the plan within a tab, you could add a Shortcut that is a link to the Plan.
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