Isn't the article suggesting that due to a different "front ends" (web app, mobile client, etc) there are different sets of requirements, which a backend should

Isn't the article suggesting that due to a different "front ends" (web app, mobile client, etc) there are different sets of requirements, which a backend should not deal with (for sake of simplicity and separation of concerns)? The BFF layer seems like a natural next step, basically a code shim to abstract away the peculiarities of each FE platform from the (presumably) "pure" business logic / API platform of the BE.