It appears that roles are not compatible with Ansible tags.

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That is not entirely accurate. Roles can still be used with Ansible tags, but there are some limitations.

When using tags with roles, only tasks defined within the role itself can be tagged. Tasks defined outside of the role will not be affected by the tags.

For example, if a role has a task with the tag "install", only that specific task will be executed if the "install" tag is called. Tasks defined elsewhere in the playbook will not be affected.

Additionally, when tagging roles, the tag must be prefixed with the role name in order for it to work properly. For example, if the role is named "webserver", a tag for that role would be "webserver:install".

Overall, roles can be used with tags, but it requires some extra attention to ensure that only the desired tasks within the role are affected by the tag.