One doesn't "switch" clients like they do operating systems.
You can install more than one at once. They're not mutually exclusive.
I want a million dollars and a DGX Spark. That's not a point, that's just a personal desire or opinion, which isn't an argument.
I already explained how this is false as my point: "I want X" is not an argument. Your desire is not an argument.
Valid points include things like "I think that users should be able to pick the client that they run a game from." That is an argument.
So, again: what is your argument that you are making?
Are you even reading the thread?
It's really not hard to understand that if you want to keep your library, you just don't delete your Steam account.
Your "POINT I AM POINTING TO" is exactly as stupid as someone saying "if I drove my car into the river, my car would be destroyed". That's correct, and the solution is trivial: do not drive your car into the river.
Yet again, you haven't made a single coherent argument.