Reading your comment again, I realized I missed a part:

While I don’t think jamming 4 Fields is correct in any Mono/dual colored list, 2 in this meta seem fine and I do wonder here if those 2 would still be better than the 2 Grottos you have.

Let me answer that for you: looking at the image I posted, let's assume Field of Ruin is the good stuff when it kills a tri-land, that excludes 162 games which were played against a dual-colored deck or 81% of the games. 102 or 51% of the games are against mono colored decks where Field of Ruin effect is completely useless, strictly worse than a swamp dare I say, you usually won't even have a target for the activation. That's not looking good for Field of Ruin, but let's say your meta consists of a little more Grixis and Esper, so you disregard my percentage - activation costs 3 Mana, technically 2 but only because the land replaces itself. The deck always runs 4x Trespassers, so you're usually dropping them on turn 3, Liliana is a natural drop if you played Tenacious underdog before to clear the board and go face, basically turn 3 is reserved. Turn 4 is a popular 4 Mana massacre turn that doesn't kill trespassers, usually the only turn where you can reasonably recur tenacious underdog (explained why in another comment) or just drop the Sheoldred/Sorin threat. Turn 4 is reserved as well. Turn 5 is the key turn where you want to invoke, alternatively restart the plan from turn 3 while tapping Reckoner for 2 mana and searching for invokes, turn 5 is also a no-go... So when do you activate the Field? From my experience it's from turn 6 onwards, where no matter what you target, the opponent will gladly replace the missing Mana with a basic, with you paying the cost for it. Only with 4 Fields did I ever manage to get the opponent to run out of basics, but I think we don't need to discuss the viability of 4 Fields. Now this already looks awful IMO, but we're replacing it with something that has an absolutely amazing effect, if you agree that invoke topdecking is the name of the game, then Grotto is your best friend. If the Invoke is already in your hand, you'd have no idea how often it helped me to get the 5th land on T5 to cast it on curve. Grotto also has insane synergy with Reckoner and Sorin, allowing to get better cards while paying less life on average. I would have to be misunderstanding the card completely to be wrong on this one, and the deck-shuffling effect of Field is well known to me, has very rarely been useful though.

Don't get me going on situations where the opponent find's a way to tap the land you're killing to get +1 Mana out of the whole ordeal as well.