Funny, I have an old 3-group Nuova Simonelli and MDX grinder that I picked up from a shop that was converting to a super-automatic. You can pull a lot of coffee with a 3-group and steam huge amounts of milk ... but I could do it only if I used the grinder - more correctly, the grinder's doser - as the Italians intended it to be used: pre-grind, fill the doser, and dose two thwacks of the doser in a double basket, tamp, and pull. No scales, no WDT, no single dosing, no bottomless portafilter, and I needed a lot of frankly anti-social concentration.
But, a funny thing happened when I got my Strega - a lever machine. Guests were attracted to the theatre of pulling espresso with a lever - something almost all of them had never seen - and were willing to wait their turn, standing around and socializing, finishing their dinner wine (probably a key point), etc. I was using an Hg-One hand grinder at the time with the Strega (pre-weighed doses). There was time to talk to guests while pulling, everything was just more relaxed. Some guests would jump in and grind. Of course, there would also be a pot of brewed coffee and a huge Espro press going for those who wanted caffeine right then and there.
Since then, the 3-group has been banished to the workshop to be raided for parts, and the dinner-party-loving ex is, well, an ex, but the Strega remains