COBT works well if used properly, I can think of VTBS and WSSS where had to use it.
As for ATC in Asia??? Not sure how you can generalise and call them bad. WSSS does seem strangely inefficient considering the western society ways and the technology, then again remember three FIRs in DEP, ARR and APP.
Now I’m sure a lot of us have flown into Bali both airline and corporate, the sheer number of flights/types coming into a single runway and single taxiway...... I call brilliant, yeah the odd hold and if one goes tech on push back it can be a pain. Oh and yes short notice closed due VIP arrival... hmmm!
Manila, etc the list goes on....