This is is enabled by default in bitcoin core.
Little back and forth between murch and ava chow:
https://bitcoin.stackexchange.com/questions/88652/does-assumevalid-lower-the-security-of-bitcoin
YES66.7%
NO33.3%
3 votes \ 1 day left
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I don't think assumevalid should be enabled by default. AssumeUTXO is a more performant tradeoff if you are willing to sacrifice trust.