The Strait of Malacca runs between the east coast of the Indonesian island of Sumatra and the Malaccan peninsula on the west coast Malaysia and is fairly narrow. It is the most direct route from India to China or the east coast of what later became Indochina.
If a hostile power took control of the Malaccan Peninsula and closed off the strait, (forcing ships to sail around the west coast of Sumatra and the southern part of the Indonesian archipelago), what deterrence to east-west trade would that have represented during the age of discovery (15-17th centuries)? Would it "merely" have been the inconvenience of a longer route? Or did sailors find such a voyage infeasible (or nearly so), given the sailing technologies and the difficulties of the route at that time? e.g Were the seas of the alternate route "too rough" for carvels or other ships of the time?
(For comparison, e.g. the Cape of Good Hope could be a major chokepoint around Africa, because the seas are not navigable for more than 30-50 miles south of it.)