Applying changes to Era is always a touchy subject. On the one hand it’s important to recognize that we all came here to play a very specific version of the game and changes have the potential to disrupt that. On the other hand, it’s very easy to lose sight of the fact that some things need to change because you never have all the information up front and sometimes you just need to adapt.
What follows is very much my personal opinion…
Chronoboon
I think the Chronoboon is an example of a change that had to happen in order to address emergent and detrimental player behaviour. Two things were happening before its introduction:
- Players were avoiding logging into their raiding mains in order to preserve world buffs.
- Players were intentionally finding ways to remove the world buffs of others in order to grief them, often finding creative ways to bypass safe areas built into the game.
Both of these had a tendency to give players incentive to stay logged out of the game when they might otherwise choose to log in, just so they could preserve their world buffs for raid. Were we living in the 2004 to 2006 time frame this is absolutely something Blizzard would have addressed and so it makes sense that they did so in Classic as well.
While Chronoboon has its flaws and is maybe not how I would go about it, it certainly works well enough. Overnight players started logging in more on their raiding mains and the world buff purge griefing epidemic evaporated.
Batching
I assume you mean spell batching here? I think the Classic team had good intentions with trying to recreate something that some players experienced in OG Vanilla due to network lag, but it wasn’t really a great idea. It was awkward and didn’t feel great. It was an amusing idea but it didn’t really work out.
I think it’s gone now though, isn’t it?
Other - PvP Ranking Changes
This is touchy for a lot of folks but personally, I think this change is for the better. The old ranking system had a lot of… toxicity… surrounding it. As with a lot of Classic’s mechanics, players hyperoptimized it and formed a lot of rigid expectations surrounding how you should engage with it. If you couldn’t follow this expectations, or simply didn’t want to, then you would find yourself with no other avenue by which to engage with the game in the form of PvP ranking. This isn’t really a good thing and again, in a live service game receiving regular updates, this kind of emergent behaviour would absolutely be addressed.
I think what Blizzard did here was a fair compromise. You can now just pursue the goal you want to pursue in the way you want to pursue it and you will eventually get your rank. Is that a good thing?
Well, it’s a bit easier than it was before but it’s not really all that much different. It would take me like 6+ weeks of fairly solid no-life play to achieve rank 13/14, which is still comparable to the old system in terms of life investment. The downside is that it takes away a lot of the need to engage with other players in order to be successful.
Personally I think grouping is a large part of WoW and the game shouldn’t introduce reasons to avoid that; however, as I said players were getting a bit ridiculous about this and folks didn’t really have an alternative.
I’m mixed on this one but I do think I’m prepared to say it’s net better. There are still reasons to group in PvP and the toxic ranker culture has been vastly mitigated. If you vibe on that sort of thing though, don’t worry, you can still go into AV and get yelled at if you don’t completely ignore the Horde in favour of killing NPCs and letting them win so everybody gets max honour gainz! 
