I'm aware of the reason behind the fairly recent change in "Save As" behavior: Apple changed the operating system's APIs such that you had no choice. Fair enough. However, this doesn't apply to other platforms. I completely understand the logic behind implementing consistent default behavior across all platforms, but I don't see any good reason to prevent users on compatible platforms from optionally switching back to the cleaner UX. I'd therefore like to request an option in the application preferences to enable the legacy "Save As" behavior.
Hi Matthias! I had to do a little digging when they updated this, but I believe you should be able to toggle this currently. It should be under Edit -> Preferences -> File Handling -> Enable Legacy 'Save As,' in the File Saving Options box (I also checked the "do not append 'copy' to filename" toggle, as I find this neater as well).