While the Brandelis Clan was once a Baron family, the old butler Foster was very qualified as a noble butler.
However, it was clear that he could not handle the heavy duty of being a court envoy for the Northern Guardian, because the people he needed to interact with in this role were completely different from those the Baron family had previously dealt with.
Although in the past, the Brandelis Clan could interact with figures like Eldest Princess Annie due to Perfikot's mother's connections, overall, the people they could connect with were usually only middle to lower-tier nobles.
But once Perfikot became the Northern Guardian, a power in her own right, the characters and matters Foster needed to deal with were utterly different.
In such times, the correct course for Perfikot was to recruit a retainer familiar with court etiquette and noble knowledge, rather than expecting Foster to handle multiple roles alone.