SnT is definitely plan B, or C - most of the time. However don't forget Burn, Affinity, Junk, lands, or Elves - where you absolutely need it. I've noticed most people fumbling with the deck or being unsatisfied with SnT are using SnT as plan A. Which sounds about right to me because SnT is a pretty shitty plan A.

I think SnT brings a tension into games that really makes the opponents life miserable if you time it properly. EOT crop rotation into their grip of 4 or 5, having them pounce on the opportunity to "2 for 1" you with a counter, only for you to untap and SnT-Titan. Lines like that. Keeping them honest to a lurking 3 mana blowout will leave you happily resolving what you really want - tops, crops, and brainstorm.

On the other hand, just running it out is actually a very strong tempo play on our part. It's like having two titans to cast. With a blue on the rise, a cavern to force the Titan is a nice way to top it off, if your opponent was able to manage the counter dance up to that point.

I still think Titania and Depths are superfluous. I actually think they might end up being their own archetype :-O. Also, Im not playing any delve cards, they don't fit well for my play style with the deck. I am jealous of all the new toys the rest of legacy has, but I'm still more or less on this (comfortably, too):

4 Cloudpost
4 Glimmerpost
2 Vesuva
1 Forest
2 Island
4 Tropical Island
4 Misty Rainforest
1 Cavern of Souls
1 Karakas
1 Bajouka Bog
1 Eye of Ugin
1 Glacial Chasm
1 Trinket Mage
4 Primeval Titan
1 Kozilek, Butcher of Truth
1 Emrakul, the Aeons Torn
4 Brainstorm
4 Sensei's Divining Top
4 Repeal
3 Crop Rotation
3 Expedition Map
2 Candelabra of Townos
2 Moments Peace
1 Engineered Explosives
3 Show and Tell
1 Pithing Needle

SB
4 Force of Will
2 Blue Elemental Blast
2 Swan Song
3 Flusterstorm
1 Engineered Explosives
1 Krosan Grip
1 Grafdigger's Cage
1 Pithing Needle