Yes. Those other things.
I'm not saying I approve of that other stuff. I'm saying if you wanted to do "all of the above" (including buy BTC via shit chain) then it makes strategic sense to minimize chain operations and use a single (ethereum) address.
Also: I can be a Bitcoin maxi while also accepting that Ethereum isn't a "centrally controlled chain". PoS is inferior to PoW for the purpose of building sound money, but Ethereum is still decentralized.