I think the reason is that the sectional charts have the text fixed to the background. If Track Up was implemented with those charts, all of the text would be at an angle corresponding to the track.
Think of the VFR charts as being a faithful rendition of the paper chart -- which lose readability if they're not north up.
That’s too bad.. I hate north up! Ne would think if Foreflight could allow VFR charts to switch between track up and north up, then Garmin could also.. This is a feature that Dynon and MGL have also that beats Garmin.. And I really like Garmin, but this one bothers me. Thanks all!