Without a hardfork PoS lacks censorship resistance once an attacker gains a majority. At least with PoW you can push back against the censor as fees naturally will increase and incentivize miners.
Hybrid PoW/PoS doesn't get around that problem it just weakens PoW in proportion to what % of the block subsidy goes to PoS.
If PoS is only used for finality, it's still PoW securing the blockchain if the finality layer fails and doesn't change anything. Seems redundant to me.
I think we should stack incremental improvements like Bawdy, Fluffy, and Tevadors proposals for example (Time Adjusted Blockweight, detective mining, and publish or perish). The same way Moneros provides strong privacy because of different layers of tech.
https://xcancel.com/evoskuil/status/1961112363727302745
https://github.com/libbitcoin/libbitcoin-system/wiki/Proof-of-Stake-Fallacy
https://github.com/libbitcoin/libbitcoin-system/wiki/Hybrid-Mining-Fallacy
https://xcancel.com/BawdyAnarchist_/status/1956537556532597238
https://github.com/monero-project/research-lab/issues/140
https://github.com/monero-project/research-lab/issues/144
