That's the point. It's to build up muscle memory in the fingers so you use the correct fingers for typing. It's to bypass bad habits you may have learned with regular typing.
It is much harder to type those typing drills, but they do help when you're building your rhythm and speed.
That would help me, the user, know what to expect and therefore avoid an unpleasant first-time experience. It would also help differentiate this typing tutor from all the other ones.
I'm a reflective guy so I was able to think of a scenario where this tool was useful, but still assumed it was meant for another scenario. Most users will just pattern match this against all the other typing tutors they've used, find it unusual, and never come back.