I love my cargo e-bike, it's my primary means of getting around these days and have put over 5000 miles on it. Most grocery trips can be done no problem, up to about 6 bags worth before I run out of room. I load it up with chairs, a cooler, and assorted gear and we bike down to the local swimming hole. The kids ride on the back, or sometimes DW rides on dates.
Cargo e-bikes are great... but only really worth the price if you use them a lot, and a big part of this is bikeability of your area. If you have calm roads and bike lanes or paths going to lots of destinations within about 2 miles then it probably makes sense.
However, I wouldn't really consider the bike you linked a cargo bike. I mean, it has a built in rack on the back that can carry 50#, but in the cargo bike world that's pretty low. My bike is an electrified Yubba Mundo with a total max capacity of 550#, which includes a stout front basket that can carry 50# plus a long tail with running boards that can hold hundreds of pounds. And the long tail format provides a large area for strapping loads and/or a large saddle bag.