I would say that explaining where guidelines are applicable is on author side. For text at hand I understand that author expects this way should be “the best”

I would say that explaining where guidelines are applicable is on author side. For text at hand I understand that author expects this way should be “the best” for everyone. Then author gives examples that even in medium project at first requirement change or first additional non-trivial rule are going to have 2-way bindings plus bunch of other plumbing implemented where “html first” doesn’t have it and someone will have to write some JS monster to handle state etc.