structuring bars

ok so i've been talking to a few ppl about the subject of structuring your bars, now i hear alot of artists who have different deliveries on their flows, some hit before the snare some structure where it falls just on or after, but my question is, is there any rules?? like if it flows and is slightly out of time on hitting on the 4th, is it still acceptable? has anyone heard any emcees do this or is it just a lazy way of rhyming??
 
Some people rap to the melody/lead instrument of the song to change the rhytm. I dont see what wrong with it as long as it flows.
 
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