Whats the point of production bonuses??

lets say you use your bonus points on production and you get for example a 50% bonus in social production. You can then afford using 30% of your work rate (Dont remember if its called work rate but that slider in the tax menu that sets how much you will spend each turn) Lets now say you star another game and select a bonus like speed +2 and instead crank up the work rate to 60% and get the same production bonus... Anyone following me here? I understand it can be good for late game when you can afford the extra bonus but you get such a better start choosing something else than a production bonus simple because its not worth it in the beginning. Also could someone please post what libary events and such we can use and still be able to submit our scores. Or some guidelines on how a metaverse score game should be played (what is allowed..feks turning on/off cultural victory makes a HUGE difference in score..)