Building Unearthed Arcana Characters?

Why can we not use Beyond to build Unearthed Arcana Characters? They can always put a tag in the Class or Subclass that allowed them to deactivate or delete it once the test was over. I have three active Campaigns and three groups of weekly pickup games available to me and exactly zero want to make characters outside of Beyond. Why offer a product that allows players to quickly build characters, hold their hand through the process that explains in detail what the class or subclass can do, ensure they have the confidence to play it, and then limit it to paper only?

What am I missing here? I don't have the time to make custom builds for everyone. Doesn't it innately limit the sample size to mostly people who have not actually played the class/subclass but instead "just vibes?"

So maybe with the rebuild they will put it back in? They can currently take out everything with a tag right now. They have accidentally done it several times. I guess we will see.