system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: Sour Cream should be the first fixin to be applied to a soft taco.

I think one of the major problems of our time is that there's an assumption that sour cream goes on LAST on tacos. Why do I feel that this assumption exists? One reason is based in fact that most of the soft tacos posted on Google images have sour cream on top. Maybe this is just because of the food beauty industry emphasizing that the taco has sour cream, or maybe it's a stereotype. My next reason that the stereotype exists is anecdotal. I have been to a few buffets. Be it with family with home cooking, or at a chain restaurant such as chipotle. Usually, sour cream is at the end of the buffet. This suggests that there exists an universal idea that sour cream is meant to be applied last. Now that we have shown how society views sour cream to be a fixin applied last, I will continue about why I think this is a bad thing.    
  
I think sour cream being applied last is a problem because it makes for an extremely messy spoon. You have two options of putting on sour cream (assuming you're not using a squeeze bag).  
  
1) You can flick the sour cream with the spoon. The problem with this method is that it is nearly impossible to get your preferred amount of sour cream on. It usually comes off as one blob.   
  
2) You can rub the spoon straight onto the taco. The problem with this method is that the spoon will carry all of the schlop with it. It will collect loose lettuce, onions, beef, and sauce/grease. This makes it so that the next time the spoon is put into the sour cream container, the container collects the schlop.   
  
Both of these methods have a compromise. I believe the no-compromise method is to apply the sour cream to the fresh tortilla before anything is added. This is done similar to how sauce is spread on a pizza. This method avoids all messiness, and it also allows you to put on a precise amount. I do not see a downside to this method.
gpt
Heat changes sour cream to be less enjoyable. You don't want it to be in contact with *hot ingredients for too long, preferably not at all. Sitting on top of cooler ingredients(such as lettuce or avocado) makes sense. It's also arguably a more pleasing mouth feel to have the sour cream neatly on top instead of in the middle, it's less muddled when it's more isolated at the top.