system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: Cream should be poured into a coffee cup before adding coffee, not after

I like to pour cream into my coffee cup before adding coffee.  My wife and I have an ongoing debate over whether what I'm doing is weird. She thinks it is but has not been able to convince me to stop.  So, since I'm bored at work, I figured that I'd see if this subreddit could help her out.  I maintain that cream should preceed coffee in almost all situations.  My reasoning: 

1. Pouring cream first allows me to pour some out if I accidentally add too much without discarding an entire cup of coffee or drinking watered down coffe I won't enjoy.

2. Pouring cream first is more efficient in terms of time and effort as the act of adding coffee mixes everything without the need for stirring.

3. Adding cream and other mixers is often chaotic at coffee shops and other crowded locations with self-serve coffee available,  as a bunch of people all try to get the correct sweetener and/or cream/cream substitute (which are often all conveniently confined to a square foot of counter space) simultaneously while also juggling hot coffee and trying to find a place to stir.  The chaos, as well as the risk of spills, would be reduced if people added these things to their cups before getting their coffee because people would be far less likely to try and stir their coffee at the same place and because while they would still be jostling with everyone else for the cream and sugar in the one square foot, they would be doing so without a cup full of coffee.

In summation, my view is that switching from a coffee first to a coffee last model of serving coffee is beneficial for both the individual coffee drinker and the organisation of larger-scale coffee provision.  You might change my view by demonstrating that the prevailing coffee first model does not have the problems I described or that it has some other advantage(s) that I have overlooked and making a good argument for why they should outweigh the problems.
gpt
If you add cream to an empty cup, you can't be sure immediately how much cream is good unless you use a specific mug with a marker at the bottom that suits you.  Otherwise you could eyeball it and guess, but this would affect how much coffee you add.  If you know you like enough cream to add a certain shade of beige or brown, then that'll mean you can add coffee till you get it.  Depending on how much cream you imprecisely added, it would mean that you could fill a cup or need a bigger cup in the end.  It might save time stirring and save time if done perfectly, but there are far more complications.  It most certainly won't go perfectly.  This could mean that you need to brew more coffee, which'll be wasteful, or throw out a remaining amount of coffee.

Adding cream or milk at the shop is only annoying during rush hour.  Otherwise that's just poor planning on the shop's part, but also isn't that big a deal.