I've recently come upon a set of lines in a video game which either disregard the rule about commas having to come before little conjunctions (and, so, but) when separating two independent clauses, or is operating on a rule that I'm not familiar with. Here's one of the lines; this is within an email in the game:
'The plating is fairly strong but I think you'll appreciate how lightweight the entire jacket will feel once the modification is made.'
Why is there not a comma before the 'but'? 'The plating is fairly strong' and 'I think you'll appreciate how lightweight the entire jacket will feel once the modification is made' are independent clauses respectively, are they not?
Additionally, in terms of dialogue, do you HAVE to adhere to the 'comma before a small conjunction separates independent clauses' rule all the time? What if I want a character to say 'I am a man and I am very bored' in dialogue WITHOUT taking a pause (comma) before the 'and'?
This is all fairly new to me.