This is how I see it. A BRG instrument provides a constantly updated bearing,
uncorrected for wind, from one's current position to the next waypoint (completely superfluous when following the magenta line). If a diversion becomes necessary, before the BRG instrument can provide a bearing to the diversion airfield, a
Direct To will first have to be performed, at which point SD flags up the heading required,
corrected for wind and the BRG instrument immediately becomes redundant for this purpose. It seems to me, therefore, that a BRG instrument is of little practical value and would just clutter the screen. Although most other GPS navigation packages do provide a BRG instrument, it seems to me they are just following a convention established a long time ago without any original thought process. It is because SD does not follow the herd and dares to be different that uniquely sets it apart from others, and which has resulted in it becoming a market leader in the field.
I hasten to add that, other than being a very satisfied user, I have no affiliation with SD.
Mike
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Samsung Galaxy Tab A8 – Android 11.0 & SD 4.0.2.0
Huawei P30 – Android 11.0 & SD 4.0.2.0
PC – Windows 10 (Home Ed) Version 22H2, Build 19045.5487, SD 4.0.2.0