I totally agree. Also when going on a long distance cycling trip I often use imported GPX files which I created or from someone else (wikiloc, routeyou, bikemap, ridewithgps, etc). When I have alternative tracks it is nice to be able to see them at the same time.
I solution could be to add the tracks/routes to a Group and tap the View button. This already works for pins and poi’s.
To be able to show multiple tracks with PE I merge them with MyGPSFile.com or GPSVisualizer.com on my laptop. This works fine when preparing a trip, but is not an option when on the road.