Hey so yes I asked this question in the Lido discord and they basically said a similar thing to what you explained. They are already working on the pool - (astroport-core/contracts/pair_metastable at feature/impl-metastable-pool · sotnikov-s/astroport-core · GitHub).
But they did say this 0.1% XYK pool might be a good temporary idea as the pool is already unbalanced and there is no ETA on their implementation currently but that it would be soon.
If their implemenation can work with other types such has Prism - xPrism, Luna - LunaX or the future Luna - STEAK it would be awesome. But from what I understand it would take some modification to use their implementation for other pools.
So I think having this 0.1% XYK pool is still a good idea. Until Astroport devs can implement this natively to work with all types of assets (I assume this will need good oracles so they probably have to wait till the launch of mainnet Chainlink oracles).
Here is what they exactly said by the way - https://i.imgur.com/zf5hZSz.png.
