I have gold for both the route planner and navigation(bought years ago). Planning routes is really easy, I share routes with several other riders, you can view a route for garmin, tom tom or whatever and overlay to ensure it will be the same on all devices.
You are using an old 660, things move on, I use an XT, I just save the route I have planned on my phone, it saves it to Garmin drive, which then uploads it automatically to my XT. Routes for others, I just export and email to them, they can load as they wish. Or on my other bike that has car play, I just use MRA Navigator.
There are 1000s of users of MRA. a thriving community and the developers offer brilliant support, the product is moving forward.
Not sure why shaping points don't make any sense. You put your own shaping points in, so if they don't make sense it is because you have placed them wrong.
Anyway, crack on, you have your views, which I think stem from a lack of user knowledge of MRA. But hey ho, happy route planning. I have no affiliation with MRA so don't really care if you want to use something else.