Quoted from Sleal16:decorative vs functional. Resin tends to be more brittle if it gets in rough situations. There some special resin formulas that have high durability properties, but price is considerably higher per bottle. I'm about to experiment with that to have some of my models safer with airballs.
As far as weaker in sunlight, not sure where that might come from. Generally you finish a model with primer/paint/topcoat so it has some protective qualities from overexposure if its outdoors a lot. But then thats the other thing, how often does something you print in resin stay outside in use.
Now the large models...Think the "not preferred" part comes from it being more challenging to have a proper support system to print successfully. Thats the only downside I see printing big. I'm slowly printing this that'll be almost a couple of feet tall. Think the bigger challenge outside of successful supports is that build plates are considerably smaller compared to FDM printers in ratio to the cost of the equipment.
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What printer did you print that on?