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One advantage, If you have step/dir servos, returning the position information to LinuxCNC
allows LinuxCNC to monitor the actual following error during operation.

DELETED as i missed a crucial point so my reply was not correct.
See PCW's reply below

OK, so an update on this issue.
Tonight I had some time to isolate where the problem is happening, and I can bring it down to just a couple of commands.

I start up Linux CNC, toggle the CNC on and home it, this is my start point.

Now in the MDI window I type the following

G53 G1 F4000 Z-10 ; This works, carriage moves down 
G53 G1 F4000 Z0 ; This works, carriage moves up 

I can repeat the above multiple times, the carriage moves up and down as expected.

BUT, if I type the following (either after typing the above or after a clean start)

M3 S10000 ; works, spindle starts and spins up
M5 ; works, spindle stops
G53 G1 F4000 Z-10 ; Spindle does not move and GCode interpreter seems to be hung!

On the console I see the following output 

mdi_execute_hook: MDI command 'M5' done (remaining: 0)
Issuing EMC_TASK_PLAN_EXECUTE --      (  +509,+280,   +23,G53\032G1\032F4000\032Z-10,)
emcTaskPlanLevel() returned 0
NML_INTERP_LIST(0x55afd11daa60)::append(nml_msg_ptr{size=208,type=EMC_TRAJ_LINEAR_MOVE}) : list_size=1, line_number=0
emcTaskPlanExecute(G53 G1 F4000 Z-10) returned 0
emcTaskPlanLevel() returned 0
NML_INTERP_LIST(0x55afd11daa60)::get(): {size=208, type=EMC_TRAJ_LINEAR_MOVE}, list_size=0
emcTaskPlanLevel() returned 0
Issuing EMC_TRAJ_LINEAR_MOVE --      (  +220,+208,    +0,605.000000,400.000000,-10.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,    +2,25.000000,25.000000,750.000000,    +0,    -1,)

I've attached the full console output from the linuxcnc command 
 
 

Oh good, and oh .... i don't know....

Yes that is it, and sorry forgot to mention, read until Host Interface section.