I’m confused on one hand some ppl praise the electronick attack capability of APG 81, but on the other side NGJ should equip F-35…

Next Generation Jammer is a stand-off full spectrum jammer (Increment 1, 2 and 3) program. It’s incorporation on the F-35 was suggested and explored at one point to replace the Prowlers with the USMC to provide essentially the same mission of airborne electronic attack. It was also an option for the USAF if it ever wanted to get back into the business of stand off AEA. It was not something that they were exploring to enable to to better defend itself on offensive strike or counter air missions. You don’t put 3 huge pods on an aircraft, equip them to produce their own power just to make an aircraft more survivable.

That is a totally separate mission area. As the recently retired ACC commander commented, the USAF and USN are happy with their current arrangement where one side invests in the stand off electronic attack capability while the other develops the stand in capability. This will continue through the Penetrating Airborn Electronic Attack program that the USAF has been reported to be working in the classified domain and as FBW mentioned PAEA is a capability mentioned by USAF leadership when it comes to the PCA program. It has also been consistently mentioned with the LRS-B program.

There currently aren’t any plans to equip the F-35 with NGJ. The USAF is studying a PEA capability for the late 2020’s. NGJ will be fielded with Mid-band capability only with low band added in increment 2.
http://www.dtic.mil/ndia/2014/PSAR/Croxson.pdf

Mid band is where a lot if not most of the immediate threats reside. It was also the weakest link in the legacy systems. The low band pods have been upgraded and were considered good enough for the Navy to seriously consider deferring the current Increment 2 plan and overhauling the legacy pods to save money.