The thing about this game is that the actual game itself works just fine under WINE. FFXIV the game client is not complicated, and it has so far survived two expansions. Shadowbringers probably won't be different.
The problem is the LAUNCHER and if the game gave us the option to use a separate downloader/download game files directly (such as through Steam) and let us log into our accounts from within ffxiv_dx11.exe (I don't remember the file name off the top of my head), we wouldn't be having trouble.

It also appears the launcher is downloading something called "libcef.dll" but not using it, which is weird. It may be a Gecko issue, but the URL for the landing page is still wrongly duplicating.