Splitbrain
As you have observed, in days of old engine manufacturers utilised Water/Water Methanol Injection to increase mass air flow through the engine when higher ambient temperatures resulted in reduced ITT/EGT margins.
Although these systems overcame the problem to some degree, they came with additional penalties such as weight (fluids & system components), additional component maintenance -not to mention the risks associated with the carriage of methanol.
As a result of substantial improvements in hot section material technology and cooling efficiencies, modern gas turbine engines are capable of producing the same amount of SHP/Thrust but at greatly increased ambient temperatures without the need for weighty and sometimes dangerous boost systems and therefore provide increased efficiencies and safety for the operators and crew/passengers alike.
Hope this helps?