When does Garmin fix it's bad DEM data or allow not to "fix" elevation on courses?

It's been years and still yesterday I got hit with it...

GPX uploaded to Garmin as a Course and FORCEFULLY corrected by Garmin:

Total distance: 35.54 km
Total ascent: 822 m
Total descent: 704 m

GPX fixed with GPS Visualizer:

Total distance: 35.54 km
Total ascent: 1275 m
Total descent: 1144 m

Actual run from GCW:

Elevation

1.252,7 m
Total Ascent
1.120,2 m
Total Descent

Still after these years, not impressed. We get a lot of new features, but the old simple features are crap.
Yes, It might work in some countries, but Garmin is a global player and it should have good global data.