I think based on my readings , being mentored by an ESFP boss, and on being raised by an ESTP, I would say SPs go deep by simply putting themselves in the situation (or a simulation of it) 1000 times, figuring it out in that moment, until eventually they have encountered almost every variation that could occur, and develop an insane feel for exactly what they can and should do in that moment. Never doubt an SP on a thing they have a lot of direct experience with.
They are masters of the simulated challenge. Iwas never bored around my dad, because he turned every errand into a speed challenge, a competition against my brother, or some sort of wager.
When I played little league, he used to create all these baseball drills that require me to learn to adjust to anticipated obstacles/complications/distractions:
To improve my hand eye and contact skills, he used to pitch golf balls at me, and I would have to hit them with a broomstick. Then we would play out a 9 inning game, where I was every hitter and I had to work each count, and drive in imaginary runners. He would constantly be throwing from different angles, talking trash, and trying to throw me off my game.
When we played with real baseballs, he loved to occasionally bean me with a pitch just to keep me from getting too comfortable. I would look at him all upset, and he would be wearing this enormous cat-ate-the-mouse grin.