The major selling point of Ethereum is it is more decentralized and more secure than others.  And chains that optimise for scale are disparaged ("Sqlana!").

Yet to scale we have accepted the L2 approach, and therefore, significantly in most cases currently, lower security.

Are Solana type trade offs acceptable now?

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Well the expectation/goal is for majority of users to be transacting on L2's. And L2's by their nature will not be as secure as ethereum. So in order to scale, there is an inherent acceptance that security is reduced for most ppl. At which point, does ethereum the ecosystem truly remain more secure than an alt L1?

For that L2, but not Ethereum base. And there are many L2s, which is a desirable consequence of decentralization. Can you explain how the L2 approach has lowered Ethereum L1 security?

No - L2s will become more secure while Solana will become more centralized over time.  Better to stay modular and decentralized than regress to monolithic data center chains.