What I don't think people get is it's no big deal to fail say 15% of the time at home. But, bakery margins are really tight and they can't afford that kind of failure regularly.
The finished cakes sell to retailers for about £20. I was just a temp worker, but the chef who supervised me clearly understood where quality ingredients were necessary, and where they could take shortcuts. For example, some recipes called for a branded liqueur to be used, whilst others used a no-name vodka + fruit essence mix.
The quality was miles ahead of anything available from a supermarket or ordinary bakery. I offended my mum by refusing to say her baking was better. (But my parents couldn't have afforded the kinds of places this factory supplied.)
I was surprised by how incapable some of the other low-paid staff were. Simple tasks like "arrange 6 half-strawberries like this in a hexagon on the cake" or "put one dollop of mix into the tray" were regularly messed up.