As far as I’m concerned there are only a few things that excuse you from walking excessively slowly through the subway. If you’re elderly, disabled, carrying heavy luggage or with a child. Other people should just walk at a regular pace bare minimum. A subway station I use frequently is sometimes populated by a very smelly individual who is down the stairs and from there at the other end of a small hallway. Long story short, you have to walk a fair amount before you make it past the smell. Yesterday there was someone walking particularly slowly in front of me making it difficult to get past with any expediency.