simply put, the f35 is an electronics powerhouse.
its jam packed with hardware and software that receives and transmits everything, and puts it all together, plus it has adequate stealth and performance.
the mig31 or even the su24 is russia's equivalent...and they arent even close to this.
too many armchair experts involved in this... with uninformed opinions. Lockheed Martin arent in, and havent ever been in, the business of producing inferior or obsolete technology.
the forces have their specification..and the contractor is required to build to that spec.
You can bet that the forces have a spec that ensures a superior platform for very specific reasons.
do you think they are going to tell the world what those specific reasons are?
not a chance.