Disklavier

Recently I have heard about supposed limitations of the MIDI 
interface vis-a-vis the Disklavier.  Perhaps someone can explain to 
me whether this is in fact true, and whether such limitations -if 
indeed they do exist - are audible.

The argument is that a MIDI interface outputs the signal 
sequentially - it serially outputs notes to be played, and so (it is 
said) chords from piano roll emulations are not played back in 
perfect synchronization but instead are slightly arpeggio'd, or 
broken. (Especially in comparison to, say, a pneumatic roll piano 
player which can activate virtually any number of simultaneous 
keystrokes  completely in parallel.) I have always understood the 
Disklavier to be able to record and play back up to 16 notes 
simultaneously.

Assuming the limitation described above is real,

1.  Is it material, i.e. can it possibly be audible, to a well-
trained ear?

2.  Is the problem interface-bandwidth-dependent? e.g. worse with a  
RS-232 serial interface and better with a USB interface?  (and what 
speed is the Disklavier's MIDI-in interface capable of?)

3.  Does the Disklavier buffer the MIDI playback signal so that the 
output to the solenoids is parallel when it needs to be?

4.  Does conversion of MIDI files to ESEQ format eliminate the 
problem?

5.  Relative to this problem, does it matter whether the MIDI output 
is from an I/O device within the Disklavier control unit, vs. a 
signal from an external PC?

6.  Is the problem greater with older model Disklaviers?

Personally I have not experienced this problem, and I listen to 
piano roll emulations frequently on a Mark II Disklavier.  Pianists 
often play broken chords anyway, so I'm not sure how one tells which 
chords are supposed to be all-at-once. ( There must be a term for 
this but sorry I don't know it. )

Any facts someone can bring to bear on this would be appreciated, 
and probably of general interest.

Mike McGregor
Double Oak, TX