re: Restaurants that serve shrimp/crawfish with vein in... acceptable?

Small shrimp I don't mind the vein (alimentary tract) left in, it doesn't affect the taste and it would be too labor intensive to remove. On larger shrimp, say <30 count, it can get gritty and be unpleasant, remove it.

Crawfish, when pealing for my own consumption I eat vein and all. When pealing for a dish, I remove it and try to save the fat.