What heats the water? What provides temperature control? How would I produce steam?
It is so single purpose that it does not feel useful by itself, it feels like the prototype for part of a whole.
I like the idea of it, and I like the idea of "part of the whole" being a composable coffee machine where one could put together components which were all independently maintainable and highly serviceable... this feels like a taster for that, but by itself is very expensive for a pump that claims to be an espresso machine but could not produce an espresso alone, and would need something else to make any espresso derived coffee.
What this replaces is a lever espresso machine, but I'm not sure anyone with a home coffee machine would've purchased a lever espresso machine without the integrated boiler... and if they would, then this is right there https://bellabarista.co.uk/collections/lever-machines/produc...
You would benefit greatly from a video that showed the workflow end-to-end of making an espresso... from bean to the final drink.