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among them BTSE, Sideswap, now Aqua

Never in my life had I heard about the first 2, Aqua is not an exchange, it's a wallet, still you can see that Liquid's blocks are completely empty most of the time.

we can store L-BTCs with a hardware wallet

You can also store, RBTC, WBTC, renBTC, BTCB, BTC.b, etc with a hardware wallet, what's the advantage to those things?