Aradiel
Legend
I've heard people say "___ will kill twinking" since Vanilla.
F2P twinks won't be killed off until it's made impossible.
Also: https://us.battle.net/support/en/article/world-of-warcraft-starter-edition
Is quite inaccurate.
You can be in other channels and talk in them, other than party/say.
Trade skills may be set at 100, but secondary skills (Still count as trade skills, do they not?) can go well past that, despite having the "Capped" message displaying, which kind of seems as if it was unintentional.
XP off did kind of kill twinking.
You can also type in /instance chat, in both BGs and dungeons. That's only a recent change though, so they may not have bothered updating it. F2P could always type in /bg chat, which was also never mentioned.
The profession thing is interesting. I'm pretty sure it's intentional. Although I noticed the cap message too. They changed it a while back. Originally, to upgrade your professions, you needed a book, or to do a quest, and those had both level and skill level requirements. Also, at level 20, your weapon skills would also max out at 100. On my old characters, they still had these skills, because on the FoS for having 400 unarmed skill, I could still see the unarmed skill. I don't think the skill played a part in weapon damage or hit chance though since they removed it.
I also think the pet battles happened pretty randomly. They didn't work for whatever reason, then decided to add it to the FAQ. It's unclear whether they intended to exclude F2P from pet battles from the start, or if they realized they didn't work and then just never decided to make them work.