In the US there are few scenarios where there is an employment contract. The vast majority of employment is "at will"; an employee can quit (or be terminated) at any time for any reason, so long as it is not expressly forbidden by law (e.g. firing someone for race, sexual orientation, age, etc). In particular, at-will employees are not guilty of breach of contract for working multiple jobs - there is no contract
This is not true, I purchased a Model 3 brand new in 2021; it has HW3 and it absolutely does phantom braking regularly on road trips. This is on US interstates.