Uhm, there are literally hundreds of millions of people in the world that use RTL languages.
For mainstream, global software this is not a niche feature but a core requirement.
Sure, but as I said I was in a small company, 2 developers only that this was the first time we worked with RTL. The project was not targeting a global audience or a casual home user, it was something about helping with your job, only supports english... my point was that we did not answer with it is just 1 customer we can ignore them , we decided we can do the work, gain a new customer this week and maybe a few more in future , every one is important. If we code the things right we don't need to touch this code at each update.
For example on a small company we had one user that needed RTL support, this ment we create backend code to store his perferences, front end code to add UI for it and testing the feature. We implemented because for a small company each user is important where big companies or projects(Firefox,GNOME will force this minorities to go elsewhere)