"A few seconds to make" is a slight exaggeration no? I had such a grinder/Gaggia set-up and it took time and effort. Producing good espresso at home without very expensive automated machines, is a commitment.
There's a lot of fiddly cleaning involved - the grinder has to be cleaned meticulously after use as do the various bits of the espresso machine. The finely ground coffee is very sensitive to static so tends to jump/attach itself to white t-shirts and plastic kitchenware - more cleaning. All this cleaning is required even if you just want to make one espresso - otherwise later uses will have a nasty taint.
There's a lot of experimentation required to produce a decent espresso with crema from such a set-up. Depending on the beans, their age, the weather, etc., the fineness for grinding and how tightly you packed the portafilter would vary. On good days I was getting 3 out of 4 but that still meant 1 in 4 (or more) were dreck.