I can't believe Jack of All Trades is even. I think it's probably the best 4 in dominion.
I think the Jack is being inflated a bit in our estimations because it plays best with BM, and simulation data is biased towards BM variants because they're easy to play. At a minimum, I can't imagine it actually being better than Remake and Tournament.
Remember that it's fast in Big Money in the same way Envoy is fast in Big Money, and that's their main strength. It's better against attacks, so it perhaps deserves to be a couple slots higher. But both of those cards have problems in many setups IMO (granted I dislike Envoy more than most people).
While missing the original context of the sentence, I agreed entirely with "I can't believe Jack of All Trades is even". Seriously. How did this card get here? Why does it even... be?
Jack can make the setup
irrelevant, and in most province games it seems to do that. Playing like a simulator is in fact an option that people have, and if it wins, why not do it? (Besides that it's less fun.)
Envoy can at least be stopped by attacks. Jack shrugs off most attacks. It beats most chapel strategies because it tends to end the game while the chapel deck is ramping up. It loses to a pair of mountebanks in my simulator, but only by about 49-51, unless I've optimized my mountebank player badly. The only thing I've seen that solidly beats it is the "Banks and Wharves" strategy (which is golden if it's not being attacked).
I don't know what you propose to do with the Tournament to beat Jack. In Dominiate, you can choose the pre-defined strategies "DoubleJack" and "TournamentPlayer", and DoubleJack wins by at least a 2-1 margin. I don't see any tweaks to its tactics that help. There's a fairly simple reason why Jack beats Tournament: Tournament is pretty terrible when your opponent tends to buy provinces before you do!