Hi Cornelius,
I understand the reasons for the change to the content of the conference, but I will continue to disagree on the name and the importance of naming things https://hilton.org.uk/blog/why-naming-things-is-hard. In the Wikiverse there is a large vocabulary for tools, policies, namespaces, frameworks, etc., and I for one invest substantial time and effort into deciding the names for anything that I think may be high profile. WMF Communications could probably produce a full day workshop about branding, and I associate the art of naming things closely with the art of branding.
Regarding the event, the summit is not an all-Wikimedia summit; it is a summit for WMF, WMF committees, and affiliate organizations. So I consider "Wikimedia Summit" to be a misleading name, and would encourage you to think further about it. Perhaps the name could be a subject that is discussed at the conference.
Good luck with the new focus of the event. I am cautiously supportive of the change of content.