I have a good overview over TEI use practices in Denmark, and (for what it's worth) I don't think anyone here would mourn the removal of @version.
A related thought: Personally I'm not fond of version numbers in name space URIs. The @version number attribute on root causes little problem and harms no one, but changing versioned name space URIs can make whole cohorts of documents invalid. Please stick to the one we have until death do us part!
I'm writing on behalf of the TEI Technical Council with a follow up on my email from 2020-07-16 regarding the version attribute on <TEI> and <teiCorpus>.
Since there was no response I would ask you once again if removing the version attribute on <TEI> and <teiCorpus> would affect your work or if we can proceed.