Unless you are writing applications using motif and/or contributing to a better remote X11 experience, the why and how do not really matter if most popular applications are using GTK/QT and electron.
It was really nice and convenient at the time but it is going the way of the dodo the same way cars with manual gearbox are because almost nobody cares and there are other ways to connect remotely.
It was really nice and convenient at the time but it is going the way of the dodo the same way cars with manual gearbox are because almost nobody cares and there are other ways to connect remotely.