These people have no idea what constitutes a good user interface. Just because they’ve taught themselves how to use the one from 1998, does not mean that grandma of 78 would find it as intuitive. Applications like this have to accommodate so many different types of people and somehow the neckbeards seem to forget that. Can’t imagine why.
Speaking as a software dev, that’s probably not the case. They probably started completely from scratch and so the inclusion of features depends on reimplementing them on the new platform. It could be as simple as not being ready yet or maybe stats show them that so few people use the feature that they don’t find it worth reimplementing it.