Anyone who thinks that this makes it a bad WoW clone has probably not played very much WoW. There have always been lots of weird bugs, and recent expansions have only gotten worse.
I haven't played the newer expansions, but the classic client (v1.12.1 in my case) from ~2006 is a nice piece of software. I've run it on old Pentium 3 clients and modern hardware under Win 11 and Wine and it just works everywhere I fire it up. It handles scaling well (I can play it 4K OLED or 1024x768 CRT), it behaves during alt-tab, and every button/tab/shortcut feels thought out.