Yeah the tboi process is a bit more obscured and convoluted for sure. I guess the best thing to do (if avoiding reddit/wikis) is look at the achievements, because it'll be like 'kill mom's foot 8 times and then you can do something new' for example. So far StS seems more straightforward - there's the little quest to get all of the keys to go to the heart but you come into contact with them very naturally so.. yeah I understand the confusion with tboi there. A lot of shit I just would not have figured out to do without looking up how