One consideration for boiler vs Thermoblock for home users is power use, which may or may not be a big enough concern for people.
Boilers take a while to heat up, so people often run them on a timer so they are good to go in the morning and turn off sometime during the day.
I found a thread that said there machine used 3kWh 7Am - 10PM. Using this as most entry level prosumer boiler machines will be similar (no insulation on the boiler) This equates to 200W/h. If you run your boiler for just 5 hours a day (7AM to Midday) you are using 1kWh/day - about 25cents - $100 a year, before making any coffee. A thermoblock heats up much quicker so is usually left off till needed.
Not forgetting the environmental impact - the timer solution usually turns a home machine on in the peak time, heating up a boiler full of water, when New Zealand power generators are burning dinosaurs.