It's already been pointed out that the entire concepts of "switching clients" is
totally irrelevant here. You can run multiple clients at once. This is so simple a child can understand it, and it was already stated above at
https://news.ycombinator.com/item?id=50348205 - the person failing to read the thread is
you.
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.