I would love to see HubSpot put some time into getting it's Service Hub and Knowledgebase KCS Verified, https://www.thekcsacademy.net/tools/verified-tools/
One of the challenges of a support team is creating and maintaining a knowledgebase that provides their customers with access to content to self solve.
HubSpot Knowledgebase and Service Hub does not fully reflect the needs of a support organization that wants to create/update content as a by-product of resolving tickets and conversations. For example, how to flag a KB for fix/update/edit, how to create a new kb within the Conversations Inbox or Service Hub Tickets pipeline.
That said, it does do a good job of making knowledge available to insert into Tickets and Conversations.