>>> Bug 2: no collision handling.
>>
>> This is a bug, IMHO.  Indeed, if an user prefers another version of
>> builtin modes or packages, they should not collide with the builtin
>> ones.  Well, they do not collide when using “guix shell”:
>>
>>      guix shell -C emacs emacs-transient -E TERM -- emacs -q
>>
>> Therefore, maybe the issue comes from some specific code from “guix
>> home”.  Hum, I do not know.
> 
> They do, in fact, collide -- as I mentioned in the e-mail you replied to:
> 
>> [...] because "guix shell" (and likewise for "environment") suppresses 
>> collision error messages:
>>
>> $ guix shell emacs emacs-transient
>>
>> (see: https://issues.guix.gnu.org/54350).

More info: (guix profiles) does not seem to handle this anywhere.