> And you make an informed choice of which framework you choose based on that.

Experience shows that choices made in the beginning of a project are very often reconsidered later when requirements change. In those cases it is nice if you choose for the worst possible outcome, so in this case you choose for a high performance GUI framework which can scale.

Obviously, today you can just write "please rewrite this badly scaling app with that scaling GUI framework" but I think that's outside the scope of the discussion.