As a developer of a pure API plugin (one that depends on some libraries but not on anything in Jenkins core) I want to be able to have a clean plugin with no implied detached dependencies regardless of the jenkins core I am targetting.
As we are detaching things from core we will install those versions of plugins if a plugin is installed that depends on an old version of core when it is upgraded.
However if the plugin is a pure api plugin there is never any need to consider detached plugins and sometimes this causes an issue (
Whilst a developer can constantly update thier Jenkins baseline - I would not want to update it (and release) to a version that is not an LTS so the above issue could still be a problem for users.
As a plugin developer I should be able to add a pom.xml configuration that states this plugin will never need any detached plugins as it uses nothing from core.