why the VOR mode use "Heading" reading instead of "Track" reading?

[NSEU]

Eagle 737 said:

but mostly we fly the ILS/MAP mode while we get "Track" reading on the top.

Old Smokey said:

The basic reasoning is that if you're in VOR (selected) mode, you're back in Raw Data without the LNAV facilities usually available from FMC / FMS / EFIS, i.e. the system has no 'knowledge' of TMG.

Isn't ILS "raw data" also?

Thanks for any insight.

Rgds.
NSEU.

P.S. BTW, what's TMG?