Agreed.

yep, the implementation thinks that the default signing key is expired due to metadata contained in the public keyring. The secret key is available to the implementation. So the error mesage No secret key can cause confusion and/or panic if the user thinks they've actually lost their secret key.

You mean the default key is expired?

fwiw, i can reproduce this on debian unstable with gpg version 2.2.17, without a redirected agent -- so the agent redirection isn't relevant here.

3.1.6 will have two ways to install the browser integration non-interactively

Thanks for the report. Indeed I've overlooked this.

We didn't found the time to organize it. There will be a OpenPGP summit this fall organized by Patrick, though

I wonder if there's potential for engaging users remotely? Also, in addition to a workshop, maybe a user interface study of how users learn and interact with the tool? I feel like doing that with people who are relatively light/new users of gpg (like me, currently struggling as I wade thru a mix of docs, some of it outdated) could be beneficial. See also: https://arxiv.org/abs/1510.08555