@Brett-Bartick it is probably historical as setting the map layer to default to OpenStreetMap was probably easier to code, everyone including Basic account users have access to the OpenStreetMap layer
if the default map was set to follow your personal map settings then I think that is extra work to code, not a huge amount extra but still some extra work for the developers to code as it would need to access your account capabilities/subscription level
maybe in the new web planner this might be changed but for the current version I definitely think not
in truth I think the "Animate" feature is a nice idea but pretty much pointless