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LibreOffice blasts 'fake open source' OnlyOffice for working with Microsoft to lock users in
(blog.documentfoundation.org)
This is a most excellent place for technology news and articles.
And what do you think gui is?
As per my previous comment, it should offer reasonable use of screen space, visual hierarchy, and well-reasoned organization. Moving bad menus to a different arrangement on the screen doesn't magically make them into good menus.
As a first step, it was a good move, although it was a decade late when it came out. They still haven't done a major redesign another decade on.