Garmin routes organisation

You, and everyone else wonders why there is no organization method in GC and Edge devices.

And how to delete them after a while. I have my devices full of old useless routes. And if I want to delete them easily I still need to use USB cable

I don't know which device you have, but on my Edge1040 I can delete them on the device itself. No need for any cables.

On the edge you can, but one by one. And if you a Fenix, consider that when you sync a route on Edge (flagging it on Strava) it is saved on the watch too. And also on the watch then you need to delete tens of route one by one.
I would like to have an option that delete the route when it syncs if I delete the route on the app.

dash1e said:

On the edge you can, but one by one.

No, you can delete selected (checked) courses at once:

-> Find a course -> Saved courses -> 3 dot context menu -> Delete: check courses to delete