>tptacek(2017May): The point of modern RSA is that we use a modulus that can't be factored by any conceivable computer, with limits derived from the physics of computation and projected far out into the future. We aren't a supercomputer advance away from factoring 2048 bit moduli.
Hello! I don't believe I called 4k RSA a "plus", I just called it a difference. But, I do like the fact that it's available, even if it isn't particularly useful right now.
I could put it another way with regards to the EC algorithms. Many people do not trust the P-series curves, or the brainpool curves, and so for them there is support for curve 25519.