First off, tokenization has been around before 2017.
In a sense, we can consider it a Trojan horse. After all, with this offer, the market is attracted to it, an option that is completely centralized, off the chain, with a number of layers of middlemen, in custody, and so on. Furthermore, the full sense of ownership, control, transparency, and others are also compromised. This is the same market which should have been convinced of the philosophies of Bitcoin.
All in all, what's being compromised with the advent of spot Bitcoin ETFs are no less than the main principles of Bitcoin. There's no more peer-to-peer with spot Bitcoin ETFs. Bitcoin is money no more.
May be true, may be not. But we can also say that with spot Bitcoin ETFs it is traditional finance that's invading Bitcoin. There are compromises from both sides.
There's no such thing as a free lunch
BlackRock and other ETF providers have been trying very hard to get spot BTC ETFs, their purpose is to profit from the management fees of traditional investors. They want BTC to come to the traditional market, not to bring traditional investors to the crypto market to buy and custody BTC themselves. They don't care about the decentralization or self-custody of Bitcoin!
The positive impact of spot BTC ETFs is very clear, and we have to trade off some of the risks and potential of the crypto market to get it. I hope that we are not too naive and spot ETFs can really help BTC and the crypto market develop in the long term with more users and new money flow.