How to structure our advanced roadmap plans

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Currently we have one master Marketing plan for all work that happens in our department. We have about 70 people in our department, across 4 main squads. We plan our work quarterly and have about 5-6 projects per quarter that required setup in advanced roadmaps. our projects are contributed to by the full team of 70 people.

My manager wants us to explore creating a plan per project. This seems like a larger effort up front because of the configuration piece. Are there any other drawbacks to this approach?

• One of the main reasons he dislikes a shared plan, is that the fields are greyed out when you filter (see my other post here: https://community.atlassian.com/t5/Jira-Software-questions/Why-do-fields-get-greyed-out-in-advanced-roadmaps-when-filtering/qaq-p/1727085#M145460)

advice on how best to set up our projects and plans?