Respectfully, everything you said has many assumptions. And trade-offs always exist. CPU mining is more decentralized in a different way (access to plebs). ASICs are more decentralized in another way (limited access to attackers)

https://sethforprivacy.com/posts/dispelling-monero-fud/#monero-cant-scale

Monero can support roughly 10x - 100x (300,000 - 3,000,000 daily txs) more transactions on current protocol with no more upgrades without straining current tech limits. It already cut down transaction size by ~80% since inception. It's scalability will keep improving over time and consumer tech is always getting better.

As long as the rate of adoption is equal to or below the rate of consumer tech advancement (this caveat applies to any crypto) Monero will be fine.

Anyone is free to attack Monero. There is a ~$3,000,000,000 bounty to do it. It hasn't yet happened. The network is still running for almost 10 years.

On the otherhand, Liquid is a permissioned, weak privacy shitcoin.