soon as we have reliable, functional quantum computing

Which we’ve been told is right around the corner for decades. The issue is that QC doesn’t scale up. If you try you get vastly more noise than signal. Current work in QC is all aimed at reducing that noise, but even for only 70 qbits, the current state of the art can’t eliminate enough of the noise for QC to be useful in most applications.

The only places it’s currently bearing any fruit is where all of the extra work to reduce noise and the delays that incurs are irrelevant because there is no classical approach at all. But even then, the costs are enormous and the benefits are miniscule.

I wouldn’t say obsolete because that implies it’s not really used anymore.

I’m not sure where you heard someone use the word “obsolete” that way, but I assure you that there are thousands if not millions of examples of obsolete technologies in constant and everyday use.

Fun fact: password controls like this have been obsolete since 2020. Standards that guide password management now focus on password length and external security features (like 2FA and robust password encryption for storage) rather than on individual characters in passwords.