[LAD] jack-midi? what are the benefits?

[Marcell Mars]

i was following the discussion on technical details.. it was
interesting and i learnt a few things.. still not enough to put it
into any code..
i sort of sorted out what is the jack-midi about but was trying to
play a bit stupid (sometimes i can't stop that game even when i want
;)) and fnd something on mailing list or web site... couldn't find
it.. these would be the questions:

what would be the benefits of using jack-midi over alsa sequencer?
is that related to jack transport somehow? how?
is that better timing? why?
is that better integration/sync with some other jack events related to
time? which events?

it would be great if answers are not just 'yes' ;) but i'm not really
looking for more than one sentence for any question... i can then
format it into something which then could be put on the web site...
hope this is not too much of wasting time of developers...

thanx