most of the problems highlighted are very correct in their observation but certainly the interpretation should be judged from seeing the situation from the other side too.
Frequency Problem : poor vhf setup
heavy rush at SMC : a/c don't want to hold to Clearance Delivery even after knowing the fact they are 21st in departure sequence. take 2.5 min for every departure and 3 min for single rwy ops (simple mathematics)
EAT : once the arrival sequence is given in holding and the trffic is vectored by the radar in heavy traffic situation. the easiest way to calculate their landing time is to multiply seq no.
i) by 2.5 in case of simultaneous rwy to get time in min to touchdown
ii) by 3 in case of single rwy ops
then the EAT gets redundant