I don’t really drink now – I had a very toxic relationship with beer in my early 30’s – so it’s not for me anyway. But I read a bit more and the internet answers would be
1/ you can get a second vessel for £40 so you can have one in use and one brewing at a time, the fancy end bit is only used while brewing.
2/ if you brew and condition for longer the quality improves. Maybe you’re polishing a turd but some reviews suggest it’s quite an improvement
3/ Works out about 1/3 of the price of the beer pumps
4/ satisfies man’s need to feel like you brewed it yourself, even if you didn’t really.