If I search the archives of en.wiki; I find many people who were intrinsically involved with Flow/LT. It might be that they liked that or that they thought it to be a disaster or that they offered general opinions on the broader aspects. Don't you think that reaching out to them is prudential, too?
Topic on User talk:Trizek (WMF)/Flow
Anyone is welcomed to participate to that consultation. I've only targeted people who identified themselves as being interested by those kind of updates.
I haven't targeted people who were involved in former discussions because those discussions have also happen on multiple wikis and, since our talk pages are like they are, it is really much more difficult to search in archives and get those names.
If you think that former participants to Flow/LQT should be more informed about that conversation, please contact them. :) We are also going to display a banner to all users soon.