philosli wrote:I would love to have a Bosco, but I got an ACS Vesuvius Evo Leva.

Bosco is designed for cafe use. If you search Youtube about Naples cafes, you'll see those busy baristas pull shot after shot on levers in fast succession. These cafes usually stick to the same type of coffee. The machines have to have unlimited water supply, thus plumb-in is the only option. I can imagine the coffee machine's consistency and throughput are the most important considerations. So it's ok for these machines to take 1 hour to fully warm up, since the cafe staff will start preparation before the first customer is in. These machines don't need multiple temperature control units to allow experimentation for different coffee: once the grind setting and the brew temperature are dialed in for the current coffee, the baristas stick to the settings for a while.

According to James Hoffman in his book, the boiler of the espresso machines grows bigger and bigger over the years, because more and more people want milk drinks. So to cope with the demand the boilers grow in size.

Home baristas have quite different requirements that Bosco was not designed for. A 5L or 6L boiler is overkill for home use. A big boiler means the machine might be too big for many people's kitchen, and takes too long to warm up for a few cups of coffee. The rigid brew temperature control may frustrate the adventures of brewing different beans in a day.

The temperature stability of such commercial machines certainly is a plus, though.