Espresso is a base for other coffee drinks, hot and cold. Putting a shot of room temperature espresso from a dispenser into one of those is going to save quite a bit of both time and money at the scale of something like a Starbucks franchise, and if you're getting your coffee from that kind of chain you're either not going to notice any difference anyway - or deny ever being there in the case of the coffee snobs. No more scooping grounds, prepping the machine, and forcing hot water through the grounds into the cup; the barista just shoves the cup under an optic, pushes a button, then moves onto the next step.
The real savings though are going to come for the manufacturers of those pre-bottled coffee drinks you find in the chillers at supermarkets; that's the kind of scale TFS is alluding to; where the coffee is brewed in industrial sized vats. Especially so if the concentrate approach is viable; add one 10L (or whatever) carton to your vat, then dilute with whatever milk/fake-milk/water/flavouring combinations needed to assemble your pre-bottled coffee-based drink. Coffee snobs are not admitting to buying those either. Also, as a side-benefit, there will be less waste as the grounds will be processed centrally so can be collected and fed into a suitable secondary product - they're excellent for providing fertiliser for some plants, for instance.
All of which probably saves you enough power and money (globally) to run a single AI data centre for a few minutes, but such is the price of progress I guess. :)