What patches did Classic have? It was always the same patch and even then it was subject to hotfixes throughout its existance (full list here -> https://us.forums.blizzard.com/en/wo...ember-2/361448 , just see the sheer volume of hotfixes required for a tested, stable patch, now imagine it with patches every month), just a few months ago they found a combustion bug making the crit bonus permanent to mages... after 1 year of classic.
What they did was simply open questlines, item availability, fix stuff like sapping world buff npcs during speech, limit daily dungeons, bla bla, and remove gates from content.
Again, you're on the same wow classic patch TODAY as it has ever been.