You seem to be conflating the choice; really, it's a choice of adding Google to the list of MITM or not. This system can't remove your mobile carrier from the circuit or stop them playing with your data.
This is not strictly true. In most cases, Chrome uses an encrypted (HTTP/2) connection to the Flywheel proxy which would bypass by ISP-side middleboxes. However, some carriers are downgrading the Flywheel connection to HTTP for the purposes of implementing adult content filtering; see https://support.google.com/chrome/answer/3517349. So we do "remove the mobile carrier from the circuit" in most cases.
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You seem to be conflating the choice; really, it's a choice of adding Google to the list of MITM or not. This system can't remove your mobile carrier from the circuit or stop them playing with your data.
This is not strictly true. In most cases, Chrome uses an encrypted (HTTP/2) connection to the Flywheel proxy which would bypass by ISP-side middleboxes. However, some carriers are downgrading the Flywheel connection to HTTP for the purposes of implementing adult content filtering; see https://support.google.com/chrome/answer/3517349. So we do "remove the mobile carrier from the circuit" in most cases.