Remember we had to re-enable key support in order to login to devices running older firmware releases?
Well… The good news is that one of those annoying options is now no more!
I'm sure any removed feature will break someone's workflow, but is DSA common enough to be meaningfully impactful today? I suspect it's past the threshold where only a tiny fraction of users need it, and they're sufficiently covered by running old client versions (ex. in a container).
Often there's a chicken and egg problem in which there is no incentive to update/replace the systems in question until the rest of the world loses the ability to talk to them. I'm glad that OpenSSH keeps pushing the needle forward.