Suspect even then those people may differ in how the MV plan is too low. E.g. Some people might want to ride more than 5 days per week. while some people might want to stick to the 5 days but do longer sessions on some of them.
I think there has been plenty of advice between the blogs, podcasts and forum on how to modify the plans, whether it’s adding in a long ride, choosing longer versions of workouts, etc. Maybe what’s needed is to summarise that into an article that sits on the FAQs page (https://support.trainerroad.com/hc/en-us/categories/200097620-Training-Questions?utm_source=Mobile%20App&utm_medium=iOS&utm_content=Training%20Plans%20FAQs), which is linked from the Plans page in the app. To be honest I was slightly surprised there wasn’t something already there (if there is I missed it) - there are articles on how to choose a plan, how to modify a workout, how to structure a season towards an A race, but nothing that I could see on how to modify a plan if you fall between 2 levels.