I really like this Evidences library approach. I’ve tried* to create something similar through attributes including notes typed as To Do, Analysis, etc., and source citations, but each time you have to create the attribute in a structure that allows it (a Person record, an Event record, etc.). The idea here is (would be) to have (in Gramps) an Evidence view with objects and sub-objects of this type that you then link to traditional Gramps objects, as you do for an event linked to a family or an individual.
If it could have its counterpart implemented in Gramps, that would be fantastic.
* For example, my personal approach:
On the left side of the image, a Workflow attribute associated (duplicated) with two persons is designed to say what I want to do. In that case looking for a way to: Eventuelle fusion d’individus[fr] = Possible merger of individuals[en].
It includes two notes: the first one is a To do note describing in more details what I want to do: Trouver s’il est possible de fusionner les deux individus Puel, Jean (I07028 & I02026) en un seul[fr] = Find out if it is possible to merge the two individuals Puel, Jean (I07028 & I02026) into one[en], and a second one which is my hypothesis: En plus de l’année de naissance identique, la signature des deux individus Puel, Jean (I07028 & I02026) est similaire[fr] = In addition to the identical year of birth, the signature of the two individuals Puel, Jean (I07028 & I02026) is similar[en]
On the right side of the image, another attribute associated to an Education event, its an Allegation type attribute, reusing the hypothesis in its title (and in its first note): Status (Non_prouvée/Prouvée/Réfutée) [N] - [Puel, Jean (I07028 & I02026) sont une seule personne] Leurs signatures similaires le prouvent[fr] = Status (Not_proven/Proven/Refuted) [N] - [Puel, Jean (I07028 & I02026) are one person] Their similar signatures prove it[en].
It includes another To do note Enregistrer l’acte de décès. Marquet, Guillaume du 8-06-28 (Républicain) à Béziers original (issu des registres des AD) pour y trouver la signature de Puel, Jean[fr] = Register the death certificate. Marquet, Guillaume dated 8-06-28 (Republican) in Béziers original (from the AD registers) to find the signature of Puel, Jean[en]
(I already have signature for the other Jean Puel record)
This is a bit of a DIY project, as there are no Evidence objects. Attributes cannot be unique, so they must be duplicated when you want to associate them with two records (which must also support attributes - which is not the case for Place records, for example), and maintaining their consistency requires ensuring what the notes they contain refer to, etc. With the integrated approach proposed here, it would be much more practical and easier to use.
Here, another example with 3 allegations to search for a person’s death. The first one is refuted with a reservation on the final date, a reservation which I have not yet found a way to indicate very clearly (putting the information at the end of the attribute title):