Where in the name of God's green earth, do you need the power plant in the ST or Platinum? I don't see it. But Ford has sucked people into paying $55,000 so the can say they have a "fast SUV." Whoopee Do. An XLT with the 2.3L is probably the sweet spot, and hopefully you can buy it for under $40,000, because that's where the price point needs to be.
I am a stickler for performance. The lease payments for a bare bones 2020 XLT AWD with bare creature comforts (heated steering wheel/seats) is something like $420 a month give or take. Hardly cheap. This is why the Kia Telluride and Hyundai Palisade is in such strong demand. For the same price as an almost bare minimum Explorer, they can get nearly a fully loaded Telluride/Palisade. I estimate the monthly lease on an Explorer ST is going to be $720/month for me, and that is a hard pill to swallow.
My 2018 Explorer XLT AWD is slow as a mofo. I tuned it and squeezed every bit of power out of the N/A 3.5 and every advantage I can grab out of the 6F55. My girlfriend has been in my Explorer in stock form, and after the tuning - she even notices a night/day difference, but it's performance is about comparable to a 2020 Explorer 2.3L at this point. If I have to pass someone on the freeway, it will be a challenge if that person speeds up to not let me change lanes or merge onto the freeway (Hey, this is Detroit/SE MI traffic).
With my 2017 Fusion Sport (same weight

ower ratio stock and tuned as an Explorer ST stock and tuned), I just point where I want to go and mash down the throttle. Roughly 90% of the typical daily driver vehicles on the road won't be able to keep up (low 12s in the 1/4 mile).
Honestly, if Ford offered a bare bones XLT AWD with that 3.0L EcoBoost (like a PIU that they'd be willing to sell to consumers), I'd take it. I don't care for SYNC 3.4 or any of the Co-Pilot garbage. I remember when Ford debuted this 3.0 in the MKZ/Continental in 2017 and refused to call it EcoBoost because it would cheapen Lincoln... Funny how that has changed.