While this might be a change for the better,leveling in Classic will most certainly be different than leveling in Vanilla. In addition to sharding making the beginner zones much more friendly to the hordes and hordes of players storming the gates when Classic comes out, theVanilla leveling process has been studied thoroughly since the game came out 14years ago. Since then, not only have players leveled multiple alts and characters through the beginning zones in Vanilla, but they have done so on a multitude of private servers intended to have the most ‘Blizzlike’ experience. So while leveling a character from 1 to 60 will still be a long, arduous process, it will no longer be marred by mistakes made by players going from zone to zone, continent to continent, searching desperately for a place to level. The zones and routes have been thoroughly mapped out by the Vanilla WoW community at large, and with the internet being much more robust in 2019, that information is just a google search away. Is that a bad thing? I would venture to say that it isn’t, as knowing where to go and what to do doesn’t make it any less challenging and time consuming. It does take away from that exploration aspect,however. You might not have those moments of wandering into Feralas for the first time, or running from Storm wind to Strangle thorn just for the hell of it,or getting lost trying to get to Iron forge from Darnassus on a fresh Night elf.No, those moments, just like many fond memories of Vanilla, are lost in time.
Only really to expand on Gráinne's comment as regards the 'collecting' and 'roster development' sections - which are, as said 'distinct' although they are intrinsically linked - I would like to point you in the direction of the in-game Achievements > Battle Pets > Collect tab. There are a series of achievements called Raiding With Leashes, pretty much all of which can be completed via the auction house - if you have the gold/inclination - or by completing old raids.
Good question. Me personally, when I use a new strat from somebody else, I always read thru the strat, and in the case I really need to level some pet, I then (likely) exclude strats that are mentioning things like “RNG”, “risk”, etc. But: I’m always happy (when using a new strat) when I see some detailed infos, so that I can estimate what is going to happen. But YMMV.
This is definitely why we do a beta test. We can also do things like reset the realm at a busy time like 4:30pm PDT to try and find the source of a certain issue where a crocolisk is losing it’s brain due to how multiple processes are interacting and mirroring code to form a cohesive world. There were similar types of issues like this back in 2004 but we wanted to try and resolve this one before the weekend for the folks who are testing.
Before work began on World of Warcraft: Classic, it was only possible for players to experience the original World of Warcraft by using private servers, which are illegal, often have stability or corruption problems, and generally are very imperfect recreations of the authentic World of Warcraft experience. As much as Blizzard has been aware of the desires of their community, until recently it seemed impossible for them to emulate Classic servers due to the technical hurdles of essentially having to run two massively multiplayer online games side-by-side. A breakthrough was then achieved that made it possible to run Classic servers on the modern architecture of current World of Warcraft servers.

As you level, you will buy new ranks of spells. If you splurge out on an item upgrade, you will not have enough gold readily available to upgrade to the latest ranks of spells: placing you behind. Moreover, you can buy gear upgrades from the Auction House (AH) or vendors. Furthermore, you may have large investments that need to be paid for professors. You will need to purchase reagents and items such as leather, bolts of cloth, alchemy supplies – unless you have a charitable friend or another high-level alt.

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