This incident makes interesting reading ref. A/T on older B737.
https://assets.publishing.service.go...009_G-THOF.pdf
para 2.1.2
Disengagement alerting requirements
The autothrottle warning on G-THOF was typical of its era. Many later generation aircraft incorporate an autothrottle warning, including an audio alert, into an Engine Indication and Crew Alerting System (EICAS). Aircraft in general and automation technology specifically has advanced rapidly in reliability. Pilots familiar with operating older aircraft, which had more variable reliability, are nearing the end of their careers and there is a generation of pilots whose only experience is of operating aircraft with highly reliable automated systems. With this increasing reliability there is concern about flight crew encountering the issues outlined by the CAA paper 10/2004: that of a normally reliable system failing.