Dad went for an 430km ride last Saturday. Chain wouldn't lose that much loob in one ride...
It's not a must do, it's just recommended to keep it happy and healthy.
When the chain is dry (ie. unlubed) the chain joints will wear out quicker and it could eat sprocket teeth quicker.
Not mandatory, just a suggestion for ~30 seconds work to save the chain snapping/sprocket getting destroyed quicker than it needs to.
they will change the role to be more senior..
Make sure you get that in writing or some sort of formal agreement on that.
They got me in here (where I am now) cheap with the promise of an early payrise once I showed I was worth it then the guy who made the promise quit a few months later and I never ended up getting the payrise.
Bastards.