Speaking for myself, I have no respect for authority that does not stem from experience, knowledge, wisdom, etc. Air hosts/hostesses have none of those attributes - they are merely parrotting rules handed down to them, without putting any thought into them.
A case in point is the electronic devices rule - clearly nonsensical and stupid. I take it as a good sample of the sense in the other rules being imposed, and therefore revert to my default mode of operation, that applies in most circumstances, unless overridden by someone who appears to deserve to have the power to tell me what to do. In other words, I do what I think is sensible, reasonable.
Therefore, yes, I do check my emails before the plane has finished moving and even (gosh!) before the passport gates. I do grab my bag at the first opportunity (though it's usually pointless to do so before the plane has stopped moving - but then it's reason that's stopping me, not rules). I do fit as much as I can get away with into my bag (which generally weighs more than 5kg - but is usually compact and easy to stow because I value those attributes).
In other words, I act like the free, responsible human being that I am, and no, I don't care one whit for "the rules" except where I have analysed them and deemed them sensible myself.
Here's some good news for you: "the rules" don't apply to you either - not unless you want them to.