I'm not a coach, but I am a pediatrician - 200 BWO! TOO MANY - and frankly, not necessary unless you are going to try to win the compulsory olympics/weed out any weak backs before optionals!
Some degree of repetitions without fall is important and clearly will lead to more consistent beam routines - however, I will say that DD has fallen ONCE in the last 2 years on beam in competition...after falling on something at all except about 3 meets (including clean routines ALWAYS at states) at old L5/6.
The time she fell this year was on a leap - at 930 pm at night in a long meet that took us 8 hours to get to because of a snow storm....would not have been helpful for her to go back to gym and do 200 leaps that week!(she scored 8.95 with fall). She was plenty disappointed with herself - and didn't need anyone telling her to be extra clean in the next weeks practices. No one will ever hit every time! Consistency on routines has come with maturity, focus and mental training as much as physical (she has now competed almost 4 seasons...)
Finishing assignments, practicing like you plan to compete, LEARNING to focus and compete, practicing skills often on low beam/floor....core strength, etc...I would say those seem more important than punishing falls with excessive repetition of the skill - and knowing that unless you hold kids back from competition until they can score all 9+ (which some do I have heard on CB) - there will always be falls, especially from younger, lower level kids.
But we come from a small state - with college gym as the goal. No elites here - no need to be the "top" compulsory gym in order to compete with other gyms for the best athletes...kids have time to learn consistency and do so. Coach does lots of beam games to increase number of sticks....and up-training during season is held off until certain number of stuck routines are done...I don't know our fall ratios in comp....certainly more clean than falls - but depending upon whether we have alot of girls who are repeaters or not, and how young they are - some days 3 falls in 8 routines would be fine - especially with only about 4-5 meets a year.
I think I'm glad my kids are out here in the Western boonies....who knows if DD would still be working her cartwheels on beam rather than on to L8 after placing at all meets in 2 seasons of L7....she really had a hard time with that stupid cartwheel on beam!