It’s unfortunate the 3rd party developers find the need to have proprietary/different formats for the FMS. During the FSX/P3D/XP-Plane days I have 5 flight planners to cover all my aircraft. It’s nice that SimBrief has the ability to export to most (if not all) 3rd party FMS, it would be nice for once if everyone used the same format.
Using the planner built into MSFS and having it available to any aircraft I purchase would be a wonderful thing without have to install multiple apps just to get charts, planning, etc.
Most people have no idea about using the KISS method. Why complicate things for users and save yourself some coding.