Nope, it's with the PGM's where IAF pilots have to buy kits from Israel (I could be wrong) because our munitions required GPS not GLONASS to be dropped over enemy bunkers located at Siachen. Because GPS signals were denied, without of it, we couldn't drop munitions as they were incorrectly hitting targets. It's still a controversy.
Because of the denial we designed our own GAGAN and later IRNSS 7 satellite constellation. Now I know that it was done to prevent a nuclear war because our warheads would too utilize GPS or Inertial navigation etc.
But by doing that, IAF knew that dependence can be a tough bitch. If we succumbed to F35 than our own AMCA program would be dumped PERIOD
IAF used Paveways on Mirages during Kargil, they did have a faulty part in the bomb which was remanufactured locally, we had sanctions placed on us and these LGBs were used using the ATLIS pod for targetting. AFAIK We had no issues related to GPS guidance except the failed Brahmos test which was rectified while relying on GLONASS, IRNSS & GAGAN. We still have plenty of Paveways in our inventory by the way.
When did IAF bomb anything in Siachen? You're confusing issues.
You are also fear mongering where non exists, fyi LCA Tejas MK-1 and MK-2 will use the GE F414, AMCA will most likely use a variant of the F414. CBU-105SFW are deployed on Jaguars along side Paveways, Griffin & Harpoons (on P-8I too along side MK-54 Torpedos). There are a host of US weapons & platforms already in use in IAF & IN. Heck our own IAC-1 uses Ge LM2500 engines for propulsion.
An F-35 buy wouldn't have to dump the AMCA, AMCA is a twin engine aircraft meant to replace Mig-29s and eventually MKI. It won't have FOC before 2030-32, well in time for the oldest Mig-29s to be replaced and MKI in phases.
F-35 is an ideal replacement for erstwhile Mig-27s & Mirages in the IAF while LCA will plug the gap for all the Mig-21s. Rafale is the ideal replacement for the Jaguar. Currently out of 100 or so Jags, only 60 will be upgraded further while 40+ will be slowly phased out by the time Rafale comes in. Hence a total requirement of roughly 72-100 Rafale is obvious.