Sony should've bought FROM after the original Demons Souls, now they're too big and too expensive I think!
Nah, From is easily in Sony's pricing range to buy, even now. Kadokawa themselves aren't even valuated at $2 billion USD IIRC, so From is valued at much less than that.
Sure, it could change, but they'd need a series of games performing at Elden Ring's level sales-wise in order to massively push up their and Kadokawa's market valuation. That's something which would take at least five years, maybe up to ten, by which point if Sony wanted to buy them (if Kadokawa were willing to sell them...or even offer themselves for purchase), they'd of already had been acquired them and a reasonable price.
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I don't disagree with the points you make, I just don't think they automatically rule-out my opinion that Sony has the ability to rehab TR and then use it better in a wide range of initiatives. That it didnt happen I still consider a mistep.
Well, anything can still happen when it comes to Tomb Raider tbh. Embracer own the IP now but Sony could buy it from them if things don't work out, or just license out the IP to do their own game with it, even a mashup between it and Uncharted.
However, I think Sony ultimately made a good decision because if they have no studios that are currently interested in doing a Tomb Raider game, they'd of had to buy Crystal Dynamics, and I think Cory Barlog's own accounts about the studio from his time there after he joined Sony Santa Monica, might've been kept in mind when the opportunity to buy them came up.
That combined with the general downward slope of the TR series since 2013, and the failure of Avengers game, it's very likely Sony would've been forced to buy Crystal Dynamics if they wanted the Tomb Raider IP and that just wasn't worth it to them.