They've got computers now

[busker]

They’ve got computers now

that can write poetry, read your mind, or paint
the Mona Lisa. Lots of very smart people
are worried about this, which is a massive
waste of energy. There’s no convincing
evidence machines can outdo
artists: have you ever seen an AI agent
board the bus without a ticket, having left
its wallet on the windowsill, distracted
by a blackbird, only to get waved through
by the driver with his stoic spine and fixed
half-grimace, and he mutters
like your father, so you shrapnel
into tears? Yes, but the machine can draw
a perfectly straight line.

Upon re-reading, I rescind my previous critique 
It must’ve been a pro-technology day
This is a perfectly fine poem. Almost perfect.
I quite like it. Except for “stoic spine”. Something less abstract than “stoic” or something other than “spine”. A stick in the spine hurts, and it prompts the thought