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@dfz1password

Who is this “adversary” who is going to sneak or break into my house

Some points to consider...

They don't need to break into your house, but would only require appropriate access to the weakest point in your computer, network, and devices. Often users unintentionally yield access via various phishing schemes.

When you print, you are necessarily exporting the data in an unencrypted format. That data is saved to your hard drive, which then becomes available to a) malware that happens to be on your system, b) stored on backup devices / cloud storage during backup operations, c) stored in spool files that almost no users will find / know about, d) transmitted over your local network in an unencrypted format, e) often stored in printer's memory.

It would not be any exaggeration to state that the vast majority of computer users grossly underestimate the various risks associated with using these complex, networked machines, nor have much working knowledge regarding avoidance or mitigation. This is why advice is typically given in generic, simple-to-follow forms, such as "don't click on unexpected links sent to you in mail / messages", or "never use the same password on external sites", or "use the safer Emergency Kit instead of printing".

An additional benefit of the Emergency Kit method. The person who needs it will have access to your up-to-date information. The print-and-save a copy method means that data is outdated as soon as you change a password, and don't print out a new copy, or if you do print out a new copy every time 1Password data is changed, you increase your exposure risk to the things mentioned above (because you are doing it more routinely).