Hamlet was much more combat based than DoH/L based, judging from what little I saw of it.
What I'd imagine a group crafting and gathering activity would be is more like a cave-in or fire or fallen tree, without any monsters in it. Just people creating tools and scaffolding and bandages and food and medicine, while gatherers worked their way through it by removing the obstacle and anyone who was free running in and getting the trapped NPC's out. That would be a group activity aimed at crafters and gatherers.
In hamlet, crafting and gathering always felt like an afterthought and it never seemed as though a full party of crafters and/or gatherers would be able to take it on without combat.
In theory, housing could be a group crafting job in itself, but more likely than not, one person with all our 50s could do it solo without any hindrance other than time.