The big thing with no changes is advocating against QoL additions added in later expansions. Examples would be dungeon finder, raid finder, shared loot, right click reporting, and sharding.
There are other topics of debate like guild banks, new graphics, xrealm bg’s, prot paladen viability, and phasing.
From what I’ve noticed all of those in the first paragraph are a NO. The topics in the second paragraph tend to spark heated debates.