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One thing I would say front suspension helps a lot with is overcoming curbs. Going up them loaded, specifically. Which doesn’t happen a lot especially with passengers but for cargo stuff it’s helpful to be able to.
Also road surfaces in England are actually quite terrible.
I’m happy with my fully rigid cargo. But I see the benefits of it :-)
MCamb-
Im not a messenger or anything but we have 3 cargo bikes in active rotation and we ride them up and down curbs pretty much every day. All are rigid setups and all have the same solution of stuffing the biggest tires that will fit in the front. I really have not had problems with 2.1-2,4 tires solving these problems but dont carry super large loads probably max around 70-100kg (so max loads of around 200kg all in.) Maybe it makes sense above that.
young_gun
seems like the solution is we just stop trying to put suspension on cargo bikes. Let the children toughen up.