Every ClickUp email that arrives is treated as a unique email thread because ClickUp does not add the necessary email headers to identify messages as related to one another. It saves a lot of time to see all new emails for the same task as one thread versus scattered throughout your inbox. Github and GitLab are good examples here.
Github example headers:
Message-ID: <OpenMage/magento-lts/pull/905/review/362616475@github.com>
In-Reply-To: <OpenMage/magento-lts/pull/905@github.com>
References: <OpenMage/magento-lts/pull/905@github.com>
GitLab example headers:
It should be trivial to add these headers which will make managing an inbox with many updates much more efficient.