Some weather will get your poncho tightly wrapped around your head. "Deadliest catch" style overalls are more fitting, and it's not the best to walk around in.
I've ridden motorbikes for many years in a subtropical city, had all the right rain gear and it still sucked to ride in the rare +5°C rain. Even southern Germany gets snow and icy rain, good luck clothing for that.
I live in southern Germany and have no problems clothing.
For rain and wet or very cold conditions I use rain trousers (insulate as well) and often my rain jacket.
5° rain is one of the best rain weather's, because you don't sweat easily just wearing rain cloths above your indoor cloths.
A much bigger problem here is cycling paths not being maintained in the winter and salt on the roads.
That's a gimmick, these were never sold in any quantity.
If it's hot and humid there's just no way to ride in appropriately protective gear.
South East Asia solution is to ride in shorts and flip-flops, with expected results in even minor falls.
I've ridden motorbikes for many years in a subtropical city, had all the right rain gear and it still sucked to ride in the rare +5°C rain. Even southern Germany gets snow and icy rain, good luck clothing for that.