Another comment for the American English course:
I’m not sure that having to search through walls of text is conducive to a pleasant experience when you are on a timer.
Especially if there are a large number of options and/or long sentences.
The same is true of the exercises where you are given a list of words to build a sentence from. If there is no timer, then it is fine. If there is a timer, and you have twenty words to search through, it is not fun.
I think that the typing ones are perfectly fine though, as you can just use an IME and the keyboard. At least on the website. I will try out some of those exercises on the app when I get the chance, but the ability to use direct input means that extra options are not as big of an issue there.