In-game mail between guildmates now is instant, but in the past, it had a 1-hour delay, just like mail between strangers. The change to instant mail made things more convenient, but removed the social interaction of having to meet up with someone to make a transaction if you wanted something sooner. So we’ve reintroduced that delay for that reason. Other conveniences such as auto-completion of names or quickly clearing a mailbox have been left in. This seemed an easy enough call given that someone could create an add-on to do the very same thing, and we felt those sorts of conveniences didn’t impact the fundamental “classic” experience.
Preface - I haven't played WoW for any length of time since quitting at the end of WotLK. I dabbled in the next few expansions, where it seemed gold was overabundant, not sure if that's what killed the gold farmers/gold bots/sellers, but I didn't seem to see any, or even think I might have a use for them. However, with WoW Classic, I can see a market for them to come back. Did Blizz ever put something in the game to eliminate this after WotLK, or was it the gold abundance that destroyed their market. If not, I see the gold sellers and websites coming back.
Leatherworking has three specializations: Elemental, Tribal and Dragonscale. I’d pick up Tribal one. It allows to craft Devilsaur set items. Hunters, Rogues, Warriors, Feral Druids, even Enhancement Shamans and Retribution Paladins are among your potential clients. On any realm there is Un’Goro Mafia on Horde and Alliance, they control whole Un’Goro Crater zone and farm Devilsaurs 24/7. They are making thousands of gold. With Dragonscale Spec you are able to craft Black Dragon Mail set. Good demand as well among DPS classes Warriors, Hunters, Shamans, Paladins, for those who wants Bis Pre-Raid items fast and easy. 
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