Again, this is simply not even close to true.
You can list all the isolated examples you wish, but you're cherry picking, and even then you're overstating the case of even those few examples. The 2021 Rays, for example, didn't rely solely on their prospects. Among their top starters were Micheal Wacha, Rich Hill, and Tyler Glasnow. None of those are/were products of the Tampa system.
More importantly, you're focusing on the few prospects who eventually get there, while ignoring the approximately 1.6 kajillion prospects who never make any impact.
Prospects occasionally work out and become productive big leagures. Once in a great while, they become impact players.
But to suggest prospects have an equal chance of becoming productive big leaguers as players who ALREADY ARE productive big leaguers isn't a rational look at reality.
I don't think trading for Montas, for example, will get the Twins far in 2022 or 2023, at least not in isolation. The FO has put this team too far in the hole. But I'd wager large amounts of money Montas is a better MLB pitcher over these next 2 years than any two Twins minor league pitchers you care to name. Deal?