I do think it’s important to know that Stanford treats EA a bit differently than its peers - it does not defer large number to RD like other schools do (the vast majority of those not admitted EA are rejected with only a few deferred), and the ratio of EA acceptance rate to overall acceptance rate is not as high as at other schools.
On the second point - for example, this year Stanford accepted 10.2% EA and 5% overall (2x). Harvard accepted 16.5% EA and 5.3% overall (3x).