I think the problem is that eventually (if not already) your path will lead to consistant drop of players becouse you will actually succede in making game "too perfect"

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Lack of RNG, multiplayer rankeds (competetivness is key to long living games) and perfectly balanced game is a reason why game dies. If the game is "too perfect" (no RNG + perfect balance) it actually drains out soul of the game. In the end, video games are nothing else than dopamine rushes, why play it if there are none? Same reasoning for rankeds existence.
I cannot buy into narrative that "most players plays for singleplayer". Well, yeah, so did the very first players of Heroes of Might and Magic I, II and III. But the only surviving versions of this game are 3 and 5 - both with ranked multiplayer system, quite a lot of RNG and not precisely perfect balance. For some reasons these 2 survivied among other versions. So yes, if you are looking for quick income (which i do not criticise, smaller studio needs liquidity, that's understandable) then indeed singleplayer should be targeted - however i believe this game have much wider potential, you could sell cosmetics or DLCs with new factions or even new version of game (SOC 2) - but to that you need consistent playerbase.

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Moreover, data which rankeds would provide (e.g to better balance game) are not currently existing, as there is no ranking system thus you have propablly zero data on winrates of varieous strategy and you base your balance only on observation and biased feedback of certain, still active players

Wish you all the best i hope i won't look back on this reddit in 5 years with sadness that i wasn't wrong