I understand
Winter Orb is generally at its best in aggro decks which does not help the actual Tezzeret strategy haha. I also just don't think it's a fun card at all. You just stop your opponent from playing magic and that's not at all the experience that I like for my drafters to have.
Two things, I think WO is good in
both aggro and Tezz. Second, I think we have a different understanding of fun. I'm not trying to persuade you because fun is subjective. I just want to offer an alternative viewpoint. I am a big believer in having "villains" in my cube. I don't want too much broken stuff, but having a small amount creates opportunities for good stories. I almost always lose to Jitte, but it was really sweet when I used
Opposition and
Llanowar Elves to eventually beat it one time. Winter Orb is a perfect mini-game card. It's also a lot more difficult to play than
Armageddon,
Sulfuric Vortex, or other cards aggro uses to seal the game. From what I've seen, most time WO is cast, neither deck can break the symmetry. It requires timing and set-up to be good. Also, I started playing Magic shortly before Legends, and so WO has a some nostalgia for me.
the difficulty with artifacts is finding the ones that fit not in every deck but do fit in some decks, passing a batterskull is pretty feel-bad and picking one is maybe worse. with
tezzeret the seeker finding only high-impact bullets, too, i wonder if he can be powerful enough without just locking people out of the game when he resolves.
There's often an undercurrent in these conversations of what is "fun" or "good design" that seem pretty subjective for me. For example, I like Batterskull and want artifacts that are good in everything. I don't mind having some broken cards, like Jitte, Swords, and Tezz locking people out of the game. I think Tezz requires so much to come together for him to be good, that if someone manages to draft the deck, kudos. A Tezz deck has yet to 3-0 any cube draft I've participated in, and I've seen a couple 0-3.