but can't yet be @ pinged from such instances) is a clear example of #EEE being exercised by #Threads upon the #Fediverse
Is, well, not a fair example because dotted usernames have been in used years before Threads and the Twitter Migration. As I mentioned, site plugins have been using @-domain.tld@domain.tld format.
If dotted usernames are going to be used to build a case of EEE by Meta, then the same argument can be used to accuse all other “plugins” using the same format, like Automattic's AP plugin and Brid.gy fed. ^_~
To clarify, I'm not defending Threads. I just find the issue of dotted usernames being linked to EEE, to build a case against Threads, as inaccurate. ^_^