Many CAD modelling packages include the rendering feature as well. This means the effort required is low as they have the model.
I’m not going to speak for anyone here, but, I will summarise a list of reasons people have given.
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I don’t want to waste filament printing the models I design, that is for the users to do.
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I’m not in it for the printing, I just like modelling.
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The renders are as good as the printed model.
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My models are easy to print, I don’t see why I should have to prove they will succeed when printed.
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I don’t have any decent photography equipment.
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The render looks far better than the printed model ever would and if I show the picture of the printed part, it isn’t as good of an advert as the render is.
Some of these can be agreed with to a degree.
I am strongly in the camp of “provide your evidence it will print.” I spend hours, days even, prototyping with prints to make sure my designs are achievable for the users when they print them.
I see providing proof my designs will print successfully as part of the designers role.