Because it's a giant waste that is destroying the planet, and is economically irresponsible and noncompetitive?
Why should the arseholes who produce things that break in one year have a competitive advantage over companies that do the right thing by their customers and by the planet?
You have the right to try to repair something. If it was built so that it was hard to repair, well you shouldn't have bought it in the first place.
Almost all rights are "made up". Anyway, I really hope this law passes because it will fuck up even more small businesses in the EU and drive them to the US.
You already have the right to pay extra for an extended warranty, or go shopping around for a version of X product that is user-maintainable. You also have the right to pay less for a shorter warranty, or buy a compact, tightly-integrated, non-repairable product. The EU's "right of repair" is merely a ban on the second category of product.
It's part of living in a free society, which means you have the right to do what you want by default.
So by default, yes, you have that right to free exchange of goods and services.