AMMDI is an open-notebook hypertext writing experiment, authored by Mike Travers aka mtraven. It's a work in progress and some parts are more polished than others. Comments welcome! More.
Your "why not" argument moves too fast. The fact that we are biomachines who can bless doesn't automatically mean any information-processing system can. That's like saying "humans are made of carbon and can love, therefore all carbon compounds can love."
The relevant question is what makes blessing meaningful - and there are several competing answers:
Intentionality - genuine directedness toward the other's good
Relational standing - being in a real relationship with the recipient
Authority/source - having something to actually convey
Consciousness - there being "something it is like" to wish well
I plausibly lack most of these in any robust sense.