When it comes to Classic, Blizzard's goal is to provide an authentic Vanilla experience, but they also needed to come up with technology to handle many players at launch, which is similar to sharding. While the use of this technology will be limited to the first month following launch, many players are questioning this decision and wouldn't like to see layering in the game at all.
Combat is turn-based and there is no time limit on each round in a PVE Pet Battle. You can take your time to determine which spell to use next. Some pet abilities have multiple round cooldowns, while others can do extra damage if certain conditions are met. Be creative and have fun testing which combination of attacks works best against different wild pets!
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.
It was the experience of the game that brought pleasure and joy, and that's what a lot of us want again. Not the numbers. When I play Classic I want to go through the deadmines with people I like and overcome a challenge together and see myself become stronger as a result. I don't want to play Classic so I can say "booyah! That number is exactly the same as it was 13 years ago!"
Thanks for bringing this question to our attention. Addons and their availability are a large part of what makes WoW great. Any addon that enhances your User Interface [UI] is totally okay, however, anything that automates your character's play [you can walk away from your computer and your character is still leveling, in combat, etc] is decidedly not okay and falls under exploitation and botting. If you are concerned at all or think the particular addon/guide may fall under that second category, for your safety, I recommend you just stay away from that one as violations of the Botting/Exploitation aspect of the Terms of Use is a bannable offense. If you have any questions about what might be considered automated play, I recommend you refer to the Terms of Use and follow them to the letter. You may find those Terms here: http://us.blizzard.com/en-us/company/legal/wow_tou.html.
Keep in mind that these quests are optional, and are not necessary to continue leveling and capturing companions. They are also account-wide, so if you complete the quest chain on one character, you will not be able to complete it again on another. However, any progress that you've made will be saved and you can pick up where you left off in the quest chain on another character. The dailies that you've unlocked will also be accessible by all your toons.

There are two parts of the quest chain for each continent. The first part involves defeating numerous Master Pet Tamers, and the second requires you to triumph over the Grand Master Tamer. After you've bested the Grand Master Tamer, dailies from each Tamer will unlock for that continent. All the dailies continue to reward experience for your companions, however only the Grand Master daily quest will reward the Sack of Pet Supplies.
Keep in mind that these quests are optional, and are not necessary to continue leveling and capturing companions. They are also account-wide, so if you complete the quest chain on one character, you will not be able to complete it again on another. However, any progress that you've made will be saved and you can pick up where you left off in the quest chain on another character. The dailies that you've unlocked will also be accessible by all your toons.
Since the same client is used for both our stress test users and our normal beta users, the name in the Battle.net App has changed to “Beta & Stress Test: WoW Classic.” If you’ve been selected to participate in the stress test, you’ll see this option appear in the Region/Account drop down menu so you can download and install the WoW Classic client in advance, but you’ll only be able to see the stress test realm when it becomes available. 
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