as it is vs besides

as it is

• Already; without adding further difficulty or complexity. 

• In the actual circumstances (and often contrary to expectations). 

• Used other than figuratively or idiomatically: see as, it, is. 

besides

• Also; in addition. 

• Used to emphasize an additional point, especially an important or stronger reason; moreover; furthermore. 

• Otherwise; else. 

• In addition to. 

• Other than; except for; instead of. 

• Beside, next to.