to some degree variables can be factored in esp. when modelling. So I still think it is wise to see what other countries are doing.
“To some degree” is not enough. A model based on shit in will give you shit out. In a pandemic, the likes of which we have never seen before, you are modelling based on the actions of people, of a society. You can not predict how people will act. What they do will also be different depending on the society you are looking at, the governement in place, the density and mix of people and places. These things have the biggest impact on spread, if you can’t model for them, the model is worthless.
Even if it were the case that you could model effectively with the known parameters adjusted for (and it really isn’t) that is not what these graphs and media reports are doing, are they? They are either using a blunt tool comparison to say that our government is shit, or is better than theirs, or for the mail, mirror, express et al to have shouty headlines predicting doom just to add more misery to