I know the material in the thing, but am a completionist and will use lower level stuff I shoudl be able to go through quickly to judge what other may be like. Because some of the more difficult stuff could be hours or days and I’d hate to waste time with needless bugs and bad usability/overly vague guiding.
And to the sequence they required you to use the nav stuff they “teach” halfway through. So it really makes no sense they bring it back in the middle. If I didn’t come in with Linux knowledge I for sure wouldn’t have made it that far without a TON of help…which they don’t give.
On the plus side the bugs pushed me to a better product 
And I post here because I know others will hit these walls and search and it’s good for them to know their not alone in their frustrations. If I just send a ticket maybe my instance gets fixed but no one else knows this could be a shared struggle. With the amount of spoilers on reddit and other sites I wonder how much “completion” of these is legit and how much is googled answers?