The only difference is that Coinbase allows you to withdraw BTC to a personal wallet, while ETFs only allow you to withdraw USD. That's why Grayscale ETF holders have to convert to USD first and then send those dollars to BlackRock to buy BTC ETF.
It's quite tedious in a sense, but for people who don't intend to ever use a BTC wallet it sounds rather convenient.
Besides that, the ETF marketing makes it more appealing to institutional investors. These folks treat BTC ownership like they treat home/car ownership (they don't mind custodians keeping their property titles). In general I'd say they blindly trust the Military - Industrial complex (the state and multinational corporations/Mega Corps).
Reputable exchanges have Proof of Reserves these days. That wasn't a thing before the FTX meltdown.
Also, with the crackdown on mixers a thief will have a hard time to launder stolen BTC... assuming that someone can find a mixer with a huge anonymity set, which is highly unlikely.
What worries me about BTC ETF is that they'll try to turn it into CBDC.
BlackRock will attach ESG variables into it, whether it's carbon credits and/or social credit score.
If you're Bill Gates or Klaus Schwab, that shouldn't worry you (for obvious reasons).
But what if you're an Average Joe ETF investor?
What if AI catches you "misgendering" (that's just one example of "hate speech") someone on social media and that gives the necessary power to BlackRock to legally confiscate your BTC ETF share?
What I'm trying to say is that you shouldn't worry about ordinary thieves. You should worry more about legalized thieves wearing suits, if you get my drift...
Even banksters won't steal you like an ordinary thief would do. They have legal ways to steal your wealth and there's nothing you can do about it (apart from not using these institutions).
I sincerely hope I'm wrong, even though I'm not an ETF investor. But what if I'm right?
Do you honestly expect no-coiners/woke/SJWs to criticize BlackRock for their dubious business practices? Rest assured they won't. They will support TechnoCommunism with a passion.
Again: I hope I'm wrong, but feel free to bookmark my post for future reference.