It's the bars. Believe it or not it is the bars. In the last 3 or 4 years many bars have been promoting "dueling piano" entertainment. There are often two pianists who also do comedy and entertain the patrons. They have become quite popular in the States. They have become so popular that it is expected nightly.
unfortunately,sometimes people get ill and then there are no longer a team of two. PAtrons have been so upset about this that restaurant/bar managers are requiring that these pair teams each have a second line show of just one of them doing a similar show as the two of them. Often this still requires two pianos. So the pianos are turned around so the one person performer can swivel between the two pianos.
As art imitates life home users are opting for the round stools as well - so they can be like the professionals.