What is the disadvantage of activating auth-nocache in OpenVPN?

By using a "default" configuration, OpenVPN clients display the following warning when connecting to a VPN server in red letters that require attention:

CAUTION: This configuration can cache passwords in memory – use the auth-nocache option to prevent this

Googling for this configuration option produces various internet sources that claim that it's not really serious, but I want to get rid of this warning because I do not want my VPN users to take the habit of Ignore warnings written in red. .

Obviously, I can do it by adding auth-nocache to the configuration file.

What is the disadvantage of doing that? Since this feature is "opt-in", there must be some kind of inconvenience, otherwise it will be enabled by default. Unfortunately, the search for "auth-nocache" in the official documentation gave no results.