The F-22 was designed with TVC from the beginning on. Totally different thing than retrofitting it. You can reduce stress levels and achieve required manouvres different. If you already designed the aircraft it is less helpful. The Su-xx may use it to reduce airframe g-load as it is a little more “flexible” than other aircraft (due to its size and weight). If loaded the airframe can only sustain (or is only cleared for) ‘low’-G manouvres.
The latest generation fighters such as the MiG-29OVT and Su-35BM have thrust vecoring to improve agility, the reason it has not been fitted to many fighters was engine technology and price costs, if you remember the americans had the F-15 ACTIVE and F-16 VISTA, besides the X-31, all those fighters were not put into service simply because of the F-22, why? costs and lack of stealth.
See that the Mig-29OVT is far far more complex than the F-15 ACTIVE and only is comparable to the F-16 VISTA
Germany insisted in thrust vectoring in the Eurofighter program, India has some powerful Su-30MKIs, the reality thrust vectoring has many uses, but economic and practical limitations have limited the application of the F-15 ACTIVE into operational service in the USAF or the Su-35BM in Russian service.
The MiG-29OVT is super agile simply to have super manueovrability.
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