this is like credit limit to leverage ratio
like if you have too high credit limit certain banks think you have high exposure so dont give cards or le.... so having couple of emi doesn't affect in fact it helps to gain LE but beyond a point too many emis does the opposite....
there are many disadvantages of emi also like the most imp is debt trap
second is blocked limit upto the next upcoming emi (especially when credit limit is low)
Third is card closure /upgrade/Le arent given untill your emi is closed