Creating a standalone chain could for many reasons be strategically useful for Sushi, but just want to point out that Sushi right now already has cross-chain support, through Ren, for free. And Sushi has it in a way where it isn’t losing composability with the DeFi ecosystems on each chain, as you would get from spinning up your own chain. You can trade non-EVM assets like BTC, DOGE, ZEC, FIL etc on Sushi on Ethereum, BSC, Polygon and Fantom right now, and Ren is adding support for Solana, Arbitrum, and Avalance this month, and has a bunch of Polkadot Parachains bridges ready for when those launch on mainnet, and releasing token bridges between all of those smart-contract chains next month ish.
Composability is the big elephant in the room that the Thorchain shillers avoid bringing up, because it’s the existential risk to that kind of model ever succeeding, and is why they are attempting to build their own DeFi ecosystem on Thorchain itself, because it will never practically integrate with the rest of DeFi as it from a technical standpoint can’t. But trying to build your own competing DeFi ecosystem as the solution to that problem is a foolish endeavor as you are competing with tens of thousands of other developers freely building on whichever chains they prefer.
The reason lack of cross-chain composability is a problem and will likely remain so is because each chain runs its own security, so as a cross-chain protocol, you need to enforce block confirmation thresholds, otherwise it is trivially easy for a sophisticated attacker to double-spend and drain all of your liquidity. And this means waiting time, which means you can’t stack protocols together like lego blocks anymore, and worse UX.
A standalone Sushichain could in that sense become more isolated from DeFi, not more integrated. And it is by no means a straightforward task building safe and stable cross-chain bridges, saying that from experience. It should def be considered whether the necessary amount of resources that needs to be spent on trying to launch such a platform (and that could fail), would have much more efficient results building tighter UIs leveraging already live bridges that provenly work. Imho Sushi would get more TVL and volume that way.