Brass Man (to me): "Yeah, you're very specific about the things you're really mean about."
Regarding Doomsday, this card really changes the math of doomsday stacks - I like the Laboratory Maniac more because you don't have to play laboratory maniac as the last card in your game, so you could cast it earlier and still win. I have actually won games by casting Laboratory Maniac, then using Time Walk to fuel the Doomsday stack.
This card drastically changes the math to Doomsday, so there's a lot of analysis to determine if this card is better than Laboratory Maniac.
I really enjoy Pioneer. as someone who enjoys the competitiveness of Magic, Pioneer is great. There's a lot of interactions, and unlike eternal formats, and even Modern, you can't just "get vintage'd". EVERY game I've played (outside the games where Sam Black demolished me, but 3 of the green cards in his deck are now banned), I feel every game I could have made different decisions which could impact the outcome of the game, which isn't a feeling I get often in Vintage; I'd say 50%. The games where you get "lol Ancestral, then force your first spell, then tinker" really don't feel good.
The question again comes down to money: $4,000 USD for Bazaars, or $18,000 USD for a Set of power? Thankfully Reserved list cards are starting to drop.
The next question, without getting into finances, is what @nedleeds said - do you want to play Dredge, even if it's the worst deck, or do you want to have different options?
Also, you could buy the bazaars now, the power later, and have the option for both, OR for Survival.
I thought Grave Troll was going to be a big hinderence to Dredge but even @Smmenen played it this year at EW. I THINK it is a safe choice.
I have a line on a set of Bazaars but I think it is more a finance question - if you buy the power you also need to buy shops or duals and forces and fetches. Its more a matter of how you feel you can best justifu yourself.