We are excited to announce we have opened a public beta that addresses some of the pain points raised here - specifically the subject line grouping and the amount of details in these comment notifications.
Any HubSpot portal can opt into the beta by visiting the link here. We have also included a feedback survey in the new notification emails as we’d love to hear how customers find these updated notifications and what else we should consider to further improve HubSpot’s comment notifications. Thanks in advance!!